AGRAULOS STRENUUS, spec. nov. Fig. 10.

Head (without the moveable cheeks) irregularly quadrangular, broadly rounded in front. Glabella rather strongly convex, conical, variable in its proportional length and width, either smooth or with several obscure impressions on each side representing the glabellar furrows; neck segment with a strong triangular projection backwards; neck furrows all across but usually obscurely impressed. In some specimens the front of the head has a thick, convex marginal rim separated from the front of the glabella by a narrow groove. In others this rim is scarcely at all developed. The eyes, shown by the form of the lobe, appear to have been semi-annular and about one-third the length of the head. The surface appears to be smooth. The following are the dimensions of the best preserved specimen :

Length of the head including the large posterior projection, 6 lines; width of the convex marginal rim, 1 line; width of the groove between the rim and the front of the glabella, } of a line; length of the glabella including the projection, 5 lines; width of the glabella at the posterior margin, 3 lines; width of the fixed cheek from the centre of the edge of the eye-lobe to the side of the glabella, 2 lines. A line drawn across the head at 24 lines from the front margin, would pass through the anterior angles of the eyes. The length of the eye appears to be nearly 2 lines.

As above remarked, this species varies somewhat in its proportional length and width, and hence the dimensions, above given, would not be found to be exactly parallelled in all the specimens.

Occurs in the grey limestone of Topsoil Head and also in the pinkish limestone of Brigus, Conception Bay.

AGRAULOS AFFINIS, spec. nov.

This species is closely allied to A. socialis and is of the same size but differs in the following respects. The glabella is broader and with the sides gently convex. The eyes are somewhat nearer the sides of the glabella. The whole of the anterior portion in front of the glabella is convex. The dorsal furrows are more distinctly impressed all around the glabella.

It occurs at Branch, St. Mary's Bay.

Genus CONOCEPALITES.

This genus has been used as a general receptacle for a number of groups which, according to several authors, constitute distinct genera. Although it has been found very convenient, there has lately sprung up a disposition to dispense with it altogether. I have no doubt but that this will be done, and I shall therefore dispose of our species as follows.

SOLENOPLEURA COMMUNIS, spec. nov.

Glabella conical, convex, about two-thirds the whole length of the head, about one-third wider at the neck-furrows than at the front; on a side view considerably elevated above the fixed cheeks; neck-furrow well defined all across; neck-segment thickened in the middle and bearing a small tubercle. The fixed cheeks are strongly convex but not so prominent as the glabella. The dorsal furrows are deeply defined all around the glabella. The front margin has a strong rounded rim, separated from the front part of the cheeks by a narrow, but distinct, groove; between the groove and the front of the glabella, there is a gentle depression, which separates the anterior angles of the fixed cheeks. The eyes are small, situated a little in advance of the mid-length of the head, distant from the side of the gla bella a little less than half the length of the head, and are connected with the front of the glabella by an obscure ocular fillet. Surface with a few scattered tubercles, just visible to the naked eye, and between these numerous minute tubercles only seen when magnified.

The glabella exhibit traces of two or three obscure furrows on each side. Length of the largest head collected five lines. Occurs at Chapel Arm, Trinity Bay.

Description.-Glabella convex, most elevated in front, obscurely angular along the median line widest at the anterior third of

the length; sides gently concave in the posterior two-thirds, and slightly diverging from each other forwards; anterior third and front uniformly rounded. Neck segment with the margin convex and projecting backwards, an obscure tubercle, or rather, an angular elevation in the middle, neck furrows all across. There are four glabellar furrows; of these, the posterior is strongly marked and extends in a nearly straight line all across; the next two are linear, slightly impressed, extend inwards about one-third the width of the glabella and are gently curved backwards, but still almost at right angles to the sides. The anterior furrow is short, extends inwards about one-fifth the width of the glabella, and curves backwards at an angle of about 45° to the sides. The dorsal furrow around the glabella is very shallow. The fixed cheeks are triangular, nearly flat, with a small elevation, close to the extremity of the posterior furrow. Front of the head with a moderately convex marginal rim, almost in contact with the glabella or separated therefrom by a narrow space. The eye-lobe starts from a point close to the side of the glabella and just opposite or a little behind the short frontal furrow, and runs with a gently sigmoid curve (at first convex outwardly, and then concave) backwards and outwards to the posterior marginal furrow, which it reaches at a distance from the sides of the glabella, about equal to the length of the neck segment. The facial suture leaves the side of the glabella a little in front of the anterior furrow, and runs outwards, nearly at a right angle, but with a gentle convex curve, to the margin.

The surface is covered with fine rippled striæ. These on the marginal rim are irregularly parallel with the margin; on the glabella they curve around the front, but further back, and on the neck segment they have a rudely longitudinal direction, curving outwards in crossing over the glabellar lobes.

Length of the head of the largest specimen examined, 6 lines; length of the glabella, including neck segment, 5 lines; width of glabella at the neck segment, 3 lines, at the front pair of furrows, 3 iines; width of the posterior margin of the fixed cheek 3 lines; length of the eye lobe, 4 lines.

When compared with the species figured by Salter and Hicks the following differences become apparent:-A. Henrici, Salter, has the eye lobes with a gently uniform curve outwards. In A. Salteri, Hicks, the eye lobes are also convex and the glabella proportionally longer, while the neck furrow "is the only one

continued across." (Hicks.) A. impar, Hicks, has the flexuous eye lobes of our species, but the marginal rim is more decidedly in contact with the front of the glabella, while the two median pairs of furrows extend further inwards.

Occurs at Chapel Arm, Trinity Bay.

PARADOXIDES TENELLUS, spec. nov.

Fig. 12.

Neck segsituated a

Description.-Glabella clavate, convex, most elevated at the anterior third of the length, front and sides in the anterior half, rounded, becoming sub-parallel in the posterior half. ment strongly elevated in the middle, where there is small tubercle, neck furrow extending all across. There are four glabellar furrows, of which the posterior extends across but is very indistinctly impressed in the middle; the next two in advance extend inwards about one-third of the width of the glabella, while the small one in front is somewhat shorter. The furrows are all nearly at a right angle to the longitudinal axis, and about equidistant from each other. The anterior margin of the head, is bordered by a narrow convex rim, which is separated from the front of the glabella by a flat space, varying in width from once to thrice its (the rim's) width. The fixed cheeks are subtriangular and nearly flat. The anterior extremity of the eye lobe is situated at a point nearly opposite, but a little behind, the anterior furrows, and is close to, but not in contact with the side of the glabella. The lobe is slightly sigmoid, its posterior extremity opposite the last glabella furrow. The dorsal furrow is distinctly impressed along the posterior half of the glabella but obscurely marked in front.

The surface is minutely granular. In all of the three specimens collected there is a small straight rounded ridge, which runs from the front of the glabella to the margin. It is situated exactly on the median line.

Of this species we have three specimens of the glabella, two of which retain portion of the fixed cheeks and show the form of the eye. The largest is three lines in length, including neck segment and front margin.

Occurs at Chapel Arm, Trinity Bay.

PARADOXIDES DECORUS, spec. nov.

Description. The form of the glabella of this species is nearly the same as that of P. tenellus but the glabellar furrows are

somewhat different. The posterior pair seem to be entirely disconnected in the middle and the next two pairs are rather more curved. The marginal rim of the front of the head, seems to be close up to, and in contact with, the front of the glabella. The surface is ornamented with minutely corrugated, raised lines which, in some places, anastomose so as to present an irregularly reticulated appearance. This at once separates the species from P. tenellus, the surface of which is minutely granulated. The surface of A. venustus is somewhat like that of this species, but the raised lines are more distant, and besides the posterior glabellar furrow extends all across. The length of the most perfect glabella examined is about thirteen lines. Only three fragments, (all of the glabella) of this species occur in the collection. Form of the eyes and of all other parts unknown. It occurs at Chapel Arm, Trinity Bay.

Genus IPHIDEA, gen. nov.

13

FIG. 13. Iphidea bella; ventral? aspect.

Of this genus we have no specimens showing the internal structure, but the external characters seem sufficient to separate it from any described generic group. The ventral? valve of I. bella, is conical, strongly elevated at the beak, hinge-line nearly straight, posterior angles narrowly rounded, sides and front nearly uniformly rounded, forming rather more than a semi-circle. Posterior side with a large false area, and a convex pseudo-deltidium, the width of which at the hinge line is nearly one-third the whole width of the shell. The dorsal valve is semi-circular, moderately convex most elevated at the beak. The hinge-line appears to be straight. The form and structure of the posterior side, (such as the area, foramen, deltidium, &c.,) cannot be made out from the specimen, owing to its imperfection. The surface is covered with fine concentric striæ, which in the ventral? valve are continued around on the area. Of these striæ there appear to be from 15 to 20 in the width of one line, their size varying somewhat in different parts of the specimen. There are also a few obscure radiating striæ. Width of ventral valve, 7 lines; length, 5 lines; height, 2 lines.