42 BRITISH OOLITIC AND LIASIC BRACHIOPODA. 



36. Terebratula lagenalis, Schlotheim. Plate VII, figs. 1 — 4. 



Terebratulites lagenalis, Schl. 1820. Petrefacta. 



Terebratula — Desk. 1836. Nouv. Ed. de Lamarck, vol. vii. 



— — De Buck. 1834. Mem. Soc. Geol. de Fr., vol. iii, p. 194, 



pi. 18, fig. 7. 



— — Tennant. 1847. A Stratigraphical List of British Fossils, 



p. 73. 



— — Bronn. 1849. Index Palseont., p. 1240. 



Diagnosis. Shell elongated, ovate, nearly straight in front; valves very convex and 

 gibbous ; beak rounded and much recurved, truncated by an entire foramen, almost 

 touching the umbo ; deltidium rarely visible, on account of the projection of the beak, 

 lateral ridges indistinct ; imperforated valve, gibbous and deepest near the umbo : posterior 

 margin rounded and extending by a gentle curve to the edge of the front, which is generally 

 straight ; • surface of valves smooth, finely punctuated. Loop simply attached to crura, 

 and extending to near the margin of the shell ; central septum well defined ; dimensions 

 variable. Length 22, breadth 12, depth 11 lines. 



Obs. As stated under the head of T. ornithocephala, this species has very little to 

 distinguish it from the above-named shell, into which it seems to merge by insensible 

 passages ; it is therefore very variable, sometimes so much thickened in front, as to form 

 an almost flat surface, perpendicular to the surface of valve, as in fig. 1 . At other times 

 it is on the contrary acute, as in fig. 2, and tapering almost into a sharp edge (fig. 4) ; the 

 beak is also more recurved than in T. ornithocephala (fig. 1), but in some specimens, as in 

 fig. 2, the deltidium is completely exposed. 



This species is abundant and finely preserved in the Cornbrash of Rushden, Norman 

 Cross, Undle, and Thorpe, in Northamptonshire, where it has been collected by the 

 Rev. A. W. Griesbach, Messrs. Waterhouse, Morris, and others. It has also been met 

 with by Messrs. Lowe and Walton, in the Fullers-earth near Bath, and from near Stamford, 

 in Lincolnshire. On the Continent it is abundantly distributed, and fine specimens, two 

 inches in length, have been obtained by M. Bouchard, from the Cornbrash of the neigh- 

 bourhood of Marquise (Pas de Calais). In Germany we meet it at Woschnau, at Grumbach 

 near Amberg, and near SchefFhausen, Wurtemberg. 



37. Terebratula sublaginalis, Bav. Plate VII, fig. 14. 



Diagnosis. Shell inequivalved, oblong, valves convex, margin line nearly straight, front 

 indented and nearly as wide as the greatest width of shell ; smaller valve convex in its 

 posterior portion, two rounded ridges rise soon after leaving the umbo and diverging 

 till they reach the lateral edges of the front, leaving a depressed concave portion or sinus 

 between them, extending and increasing in concavity as it approaches the front. Beak 

 rounded, without distinct lateral ridges, and truncated by an entire foramen of moderate 



