LUCINA CLEBURNI (sp. nov.).

(Plate I, Figs. 3 and 4.)

Shell moderately large, indistinctly pentahedral in marginal outline; valves moderately convex; posterior side truncate, basal border rather short, nearly straight or slightly convex, abruptly rounded up to the posterior border and broadly rounded up to the antero-basal border; front prominent, somewhat abruptly rounded above; antero-dorsal border slightly concave, nearly horizontal; postero-dorsal border slightly convex, sloping downward and backward, its whole length occupied by a large prominent external ligament; lunule very narrow, hardly so wide as the ligament, and extending the whole length of the anterodorsal border; beaks small, situated subcentrally; umbonal ridge not well defined, passing near the posterior and postero-dorsal borders. Surface marked by the usual distinct lines of growth, and also by somewhat numerous strongly and sharply raised concentric lines, especially upon its upper and umbonal portions.

Length 37 millimeters; height 30 millimeters; thickness, both valves together, 14 millimeters. (Museum No. 11469.)

This fine shell bears some resemblance to the preceding, but it is a more robust form, its transverse diameter is proportionally greater, the front more prominent, the basal border less abruptly rounded, and the external ligament larger and more prominent. In its large size it resembles L. occidentalis Morton, as identified by Meek and figured in vol. ix, U. S. Geol. Sur. Terr., but in its abrupt posterior truncation and greater prominence of the upper portion of the front it differs conspicuously from that species.

The ligament of this shell is unusually large and prominent for that of a Lucina, but it has the outward characteristics of a species of that genus. Besides this, an imperfect separate valve, too fragile for preservation, which was found associated with the other specimens, and which apparently belongs to the same species, shows the hinge, pallial line, and muscular markings which characterize Lucina.

Position and locality.-Later Cretaceous strata (equivalent with the Fox Hills and Fort Pierre Groups of the Upper Missouri River region) in the vicinity of Julesburg, Colo., where it was obtained by Mr. W. W. Cleburn, and in whose honor the specific name is given.

SOLEMYA BILIX White.
White.

(Plate I, Fig. 9.)

Solemya bilix White, 1880, Proc. U. S. National Museum, vol. iii, p. 158.

This species was also found by Mr. Celeburn, near Julesburg, Colorado.

PTERIA (OXYTOMA) ERECTA White.

(Plate I, Figs. 7 and 8.)

Pteria (Oxytoma) erecta White, 1880, Proc. U. S. National Museum, vol. iii, p. 157.

DESCRIPTION OF A NEW SPECIES OF GOBIESOX (GOBIESOX RHES. SODON) FROM SAN DIEGO, CALIFORNIA.

By ROSA SMITH.

Allied to Gobiesox reticulatus Girard.

Form essentially like that of G. reticulatus, and, as in that species, the snout bluntly and evenly curved. The greatest height of the body is across the pectoral fins, and the width is also greatest between those fins. Head broader than body but less deep. Cleft of the mouth extending to the anterior rim of the orbit. Lips thickish as in G. reticulatus. The anterior incisors of the lower jaw are less declined than those of G. reticulatus, nearer vertical than horizontal, each of them tricuspid at tip, the central cusp largest; about eight incisors on the mandible. Teeth of the upper jaw conical, in an irregular series of seven to nine, the alternate four or five being larger than the other three. Gill-membranes free from the isthmus. Opercular spine sharp.

Sucking disk entirely similar in form and structure to the other spe cies, its tips extending nearly as far as do the free tips of the pectorals. The distance from vent to base of the caudal fin is contained in the distance from vent to tip of snout slightly more than one and a half times (2 in G. reticulatus).

Length of head contained two and three-fourth times in total length to base of caudal as in G. reticulatus; the tail proportionally longer than in G. reticulatus, although the vertical fins have fewer rays; in both the dorsal fin is a little longer than the anal, having its origin in advance of the anal and terminating opposite it. The caudal fin is rounded and of a yellowish-white color, generally with few punctulations and these at its base. Dorsal rays 11; anal 10.

Slate color rarely nearly plain, usually with rather broad, distinct, slightly mottled with paler yellowish bands across the dorsal region; the first a distinct band through the eyes, the second much broader and situated at the posterior margin of pectorals; a roundish spot of same color may be seen on each side at the base of the dorsal fin; these spots, when viewed from above, form a third light band, its distance from the second band equalling that between the orbital band and the second or central one. A dark bar at base of caudal. Underneath yellowish, with dark punctulations on the lower jaw and the belly, fine punctulations on the light bands, on dorsal and pectoral fins and base of caudal.

*

This species is known to me by about fifty examples collected by Mr. Mr. Charles R. Orcutt, and found adhering to stones in company with Typhlogobius californiensis at Point Loma. It differs from G. recticulaTyphlogobius californiensis Steindachner, Ichthyol. Beiträge VIII, Sitzgber. Wien. Akad. 1879, 142 Othonops cos m. = Proc. U. S. Nat. Mus. 1881, 19.

tus in the fewer rays in dorsal and anal and in the tricuspid teeth. The usual color is also different.

The type specimens have been presented to the National Museum, and they are numbered 28,396 on the Museum Register. The largest measured 12 inches.

DESCRIPTION OF A NEW GENUS AND SPECIES OF COTTIDE.

By W. N. LOCKINGTON.

Chitonotus gen. nov.
Allied to Artedius Girard.

Anal papilla of males excessively developed, and terminating in a narrower crescentic portion, from which springs a long tubular filament. First dorsal incompletely divided into two portions, the anterior the shorter. Lateral line armed with a series of keeled scales, toothed on keel and on hinder margin. Entire upper portion of body, save a narrow area along the base of the dorsal fin, covered with small strongly ctenoid scales. Other characters as in Artedius. Type Chitonotus megacephalus Lockington.

This genus is instituted for the reception of Artedius pugettensis Steindachner (Ichthyol. Beiträge V. 133) and of the species here described.