64 CRETACEOUS LAMELLIBRANCHIA. 



Pteeia (Pskudopteea) anomala {Soicerlnj), 183G, Plate IX, figs. 2a-d, 3rt, h, 40,1. 



1836. AvicuLA ANOMALA, /. de C. Suwerhy. Traus. Geol. Soc, ser. 2, vol. iv, pp. 



240, 342, pi. xvii, fig. 18. 



— A. E. Beiiss. Die Yerstein. der liiilim. Kreiilefunnat., 

 pt. 2, p. 22, pi. xxxii, figs. 1 — 3. 



— H. B. Geinitz. Cliar. d. Seliielit. u. Petref. des siichs. 

 Kreidegeb., pt. 3, p. 80, pi. xx, fig. 38. 



— — Griindriss d. Verstein., p. 459, pi. xx, 

 fig. 5. 



— — Das Quadersandst. oder Kreidegeb. iu 

 Deutsclilaud, p. 170 {partim). 



— J. Morris. Cat. Brit. Foss., ed. 2, p. 163. 



— A. Briart and F. L. Cornet. Descript. Mineralog. Gi'ol. 



et Pal. de la Meule de Bracquegnies (Mem. 

 cour. et MJm. des Sav. ctraugers, vol. xxxiv), 

 p. 52, pi. iv, fig. 7. 

 1869. — — F. J. Pictet and G. Campiche. Foss. Terr. Crct. Ste. 



Croix (Mater. Pal. Suisse, ser. 

 5). p. 71. 

 1871. — — F. iSfolicxka. Palseout. Indica, Cret. Fauna S. ludia, 



vol. iii, p. 398. 

 ? 1873. — — H. B. Gelnitz. Das Elbthalgeb. in SacLseu (Pateouto- 



grapliica, vol. xx, pt. 1), p. 207, pi. 

 xlvi, figs. 5, 6. 

 lyyij. — — Ji, Michael. Zeitsehr. der deutsch. geol. Gesellseh., vol. 



xlv, p. 233. 



Nou 1846. — — A. d'Orhiijnij. Pal. Franc. Terr. Cri't., vol. iii, p. 478, pi. 



cccxcii, figs. 1 — 3. 



— 1850. — — d'Orhigny. Prodr. de Pal., vol, ii, p. 167. 



? — 1877. — — A. Fritseh. Stud, ini Gebiete der bdhm. Kreidefoniiat. : 



II, Weisseuberg. u. Malnitz. Scliieht., p. 

 128, fig. 108. 



— 1883. _ _ _ Ibid., Ill, Iserschicht., p. 109. 



Description. — Shell rather large; outline (without the ears) triangular, very 

 oblique ; anterior margin convex, forming a rounded angle with the sinuous postero- 

 ventral margin. Umbo of left valve pointed, acnte, near the anterior extremity. 

 Apical angle about 45°. 



Left valve very convex, with a strong, rounded ridge extending from the 

 umbo to the postero-ventral extremity. In front of this ridge the shell curves 

 rapidly downAvards, and becomes nearly vertical to the plane of the valves near 

 the anterior margin and near the anterior ear. Behind the ridge the valve is 

 flattened and slopes dorsally (fig. 2 o) ; l)ut this part is sometimes divided into two 



