This neat shell is distinguished by its slight subpentagonal form and small umbo; its nearest ally is W. indentata. W. perforata has been long known in Great Britain; Portlock confounded it with Terebratula ornithocephala. In the Bristol Museum, I found it in 1860 labelled T. punctata, with which species it has more frequently been confounded. On the Continent it ranges throughout the Lower and Middle Lias, but appears to be most abundant in the inferior part of the Lower Lias; its distribution in this country is much the same. Ammonites angulatus zone. Island Magee and Glenarm, Co. Antrim (Tate). A. Bucklandi zone. Horfield, Ashley, Bedminster, Keynsham (Tate), and Salford (Wright) near Bristol; Camerton, Shepton Mallet (Moore); Wells (Brodie). Belemnites acutus zone. Ballintoy, Co. Antrim (Tate). Am. spinatus zone. Wellingore Cutting, Lincolnshire (Judd).1 2. TEREBRATELLA LIASINA, Deslongchamps (1853) id. Mem. Soc. Lin. de Normandie (1856). 3. MEGERLIA PERRIERI, Deslong. 4. MEGERLIA SUESSII, Deslong. The three last species, with some others which characterize the remarkable deposit in the Middle Lias at Fontaine-Etoupe-four, Normandy, were discovered by Mr. C. Moore, at Whatley, near Frome. 5. ZELLANIA OBESA, Moore. Quart. Journ. Geol. Soc., vol. xxiii., p. 240. Lower Lias (zone of Am. angulatus?), Stout's Hill (Moore). Zellania Laboucheri (Moore) and Z. Davidsoni (Moore) have occurred to Mr. Moore in the Lower Lias, Brocastle, etc., as well as in the Inferior Oolite. 6. KINGENA? DESLONGCHAMPSI, Davidson (Terebratula). An. Mag. Nat. Hist., vol. v., pl. 15, f. 6 (1850). Middle Lias, Whatley (Moore). THECIDIUM TRIANGULARE D'Orbigny. This species till recently was only known in the Inferior Oolite, but Mr. C. Moore records it from the Lower Lias of Brocastle, Keynsham, etc.; the Middle Lias Ilminster; Upper Lias, Charter House mine; Fuller's Earth, Comb Down, Bath; and from the Coral Rag. 7. THECIDIUM GRANULOSUM, Moore. Trans. Nat. Hist. Soc., Somersetshire, 1854, p. 13, t. 2, f. 1-6. Middle Lias, Whatley, and Inferior Oolite, Dundry (Moore). 8. THECIDIUM SUBSERRATUM, spec. nov. Shell subquadrangular, attached by the whole of the lower surface of the ventral valve, the front of which is much elevated; area triangular, narrow, hinge line long and straight. Dorsal valve convex smooth, inflated at the umbo, interior with a plain border, within which is a raised serrated margin, from which arises a longitudinal medial lanceolate septum, 1 Waldheimia Mariæ, d'Orb, regarded by Mr. Davidson as a variety of W. cornuta, is described as a distinct species by E. Deslongchamps Pal. Fr. t. 20, f. 1-7; it occurs in the Marlstone of Ilminster. Occupying two-thirds the length of the shell; the muscular depressions are smooth (?). This species is related to T. rusticum, T. granulosum, and T. triangulare, but presents a combination of characters which distinguishes it from them. Locality, Brocastle (zone of Am. angulatus). Possibly T. triangulare, Moore (apud D'Orbigny), from the same beds, belongs here. Lower Lias (zone of Am. angulatus), Brocastle (Tate). 9. SPIRIFERINA OXYPTERA, Buvignier. Mem. de la Soc. Philom. de Verdun, vol. ii., p. 14, t. 8, f. 8 (1843). Lower part of Middle Lias, Mull. (Geikie). 10. SPIRIFERINA VERRUCOSA, De Buch (Delthyris). remark. t. 7, f. 2 (1831). Petrif. This species, included by Mr. Davidson under S. rostrata, is now regarded by most palæontologists as distinct. It characterizes the zone of Ammonites Jamesoni, and is found at Cheltenham, Aston, etc., in North Gloucestershire. Middle Lias, Radstock, &c. Though ranging throughout the upper part of the Lower Lias in Germany and France, it has not yet been met with in beds of that formation in this country.' 11. SPIRIFERINA DESLONGCHAMPSI, Davidson. An. Nat. Hist. (1862), t. 15, f. 4. Middle Lias, Whatley (Moore). 12. SPIRIFERINA OXYGONA, Deslongchamps. Bull. Soc. Lin. de Normandie, t. 3, f. 5-10 (1858). Middle Lias, Whatley (Moore). 13. SUESSIA IMBRICATA, Deslongchamps. Annuaire l' Institut des Provinces, t. 1, f. 12-16 (1855). This genus was, until Mr. Moore's discovery, unknown in British strata. Middle Lias, Whatley (Moore). 14. LEPTENA ROSTRATA, Deslong. Annuaire l'Inst. des Provinces, t. 1, f. 17-18 (1855). Middle Lias, Whatley and Munger (Moore). 15. RHYNCHONELLA PLICATISSIMA, Quenstedt sp. Handb. Petref., t. 36 (1852). R. anceps, pars Chapuis and Dewalque (1854). R. costellata, Piette (1856). 1 According to E. Deslongchamps, three varieties of S. rostrata, described by Mr. Davidson, are distinct species, and are respectively named S. Hartmanni, Ziet, S. pinguis, Ziet, and S. ascendens, E. Deslong; they occur in the Marlstone of Somersetshire. R. variabilis (pars), Auctorum Anglicorum. This species can readily be distinguished from R. variabilis, Schloth., with which it appears to have been confounded in this country, by its numerous ribs, twenty-five or so in number. In Germany, France, and Britain, it ranges throughout the Lower Lias; and is very abundant in the Bucklandi limestones in the West of England, as at Horfield, Ashley, Keynsham, near Bristol; Badgsworth, Cheltenham (Tate); Evercreach, near Bruton (Holl). 16. RHYNCHONELLA OXYNOTI, Quenstedt sp. Handb. Petref, t. 36, f. 4-5 (1852). Terebratula Maceana, D'Orbigny Prodr., p. 221 (1850). Rhynchonella Buchii, Chapuis and Dewalque (1854). Rhynchonella ranina, Suess (1860). This species is not so clearly distinguishable from R. variabilis as R. plicatissima, though it does not apparently graduate into it; and the fact of its occurrence on the same horizon in France, England, and Germany induces one to regard it for the present as a distinct species. R. oxynoti was found by Oppel in the zone of " Am. oxynotus" in Gloucestershire. 17. RHYNCHONELLA EGRETTA, Deslongchamps. Bull. Soc., Lin. de Normandie, vol iii., t. 4, f. 4-6 (1858). 18. RHYNCHONELLA SUBSERRATA, Munster; R. FALLAX. Deslong. id. vol. vii., t. 3, f. 1-5 (1863). Both species recorded by Mr. Moore from the Middle Lias, Whatley. 19. RHYNCHONELLA CORONATA (Moore), Geologist, 1861, t. 2, f. 23. Upper Lias, Ilminster.' 20. RHYNCHONELLA JURENSIS, Quenstedt (Terebratula), Jura, t. 41, f. 33-35. Mr. Lycett (Proc. Cotts. Club, vol. ii., p. 142. 1860.) records a variety of the above species from the Upper Zone of the Supra Liassic Sands, and also a variety of R. plicatella, Sow., from the Lower Zone. 21. CRANIA GUMBERTI, Deslong., loc. cit. vol. vii., t. 3, f. 6–10. Middle Lias, Whatley (Moore). 22. CRANIA LIASSICA, Moore. Quart. Journ. Geol. Soc., vol. xxiii., p. 539. 1867. Lower Lias (Zone of Am. angulatus), Brocastle, Stout's Hill. 23. DISCINA HOLDENI, Tate. Quart. Journ. Geol. Soc., vol. xxiii., p. 314 (Nov., 1867). Ranges from the Zone of "Am. angulatus" to that of "A. Ibex” in England and Ireland, and throughout the Lower Lias in the east of France. 24. DISCINA ORBICULARIS, Moore. Quart. Journ. Geol. Soc., vol. xxiii., p. 540 (Dec., 1867). Possibly is the young of D. Holdeni. Lower Lias, Shepton, Southerndown, and Bedminster. 25. DISCINA DAVIDSONI, Moore. Geologist, 1861, t. 2, f. 16-18, 1 Mr. Moore records R. subtetrahedra, Davids., in the Marlstone of Ilminster; R. subvariabilis, in the Middle Lias, Holwell; and R. concinna, in the Middle Lias, Camerton. I regard these as doubtful determinations. |