CYPRINA. 141 



Pictet and Roux l to G. ervyensis, Leymerie, and by Pictet and Campiche - to G. 

 angulata, Sowerby. English examples were identified with G. angulata by J. de C. 

 Sowerby, Forbes, and Morris, but were regarded by d'Orbigny as belonging to a 

 distinct species which he named G. Sowerbyi, and mentioned as types the 

 specimens collected by Fitton from the Hythe Beds near Folkestone. G. Sowerbyi 

 also resembles G. neocomiensis, d'Orbigny. 3 



Distribution. — Hythe Beds of Hythe. Sandgate Beds of Parbam Park. Lower 

 Greensand between Atherfield and Blackgang. 



Cypkina (Venilicaudia) angulata (Sowerby), 1814. Plate XXII, figs. 1 — 4. 



Text-figs. 23, 24. 



1814. Venus angulata, J. Sowerby. Min. Conch., vol. i, p. 145, pi. lxv. 



1828. Cyprina angulata, /. Fleming. Hist. Brit. Airimals, p. 444. 



1836. J. de C. Sowerby. Trans. Geol. Soc, ser. 2, vol. iv, 



p. 240. 

 1850. A. d'Orbigny. Prodr. de Pal., vol. ii, p. 161. 



1854. /. Morris. Cat, Brit. Foss., ed. 2, p. 199 (partim). 



1870. F. Stoliczka. Palffiont, Indica, Cret. Fauna S. India, 



vol. iii, p. 193. 



Non 1868. A. Briart and F. L. Cornet. Meule de Bracquegnies 



(Mem. cour. et Mem. des Sav. etrangers, 

 vol. xxxiv), p. 68, pi. viii, figs. 26—28. 



Description. — Shell large, sub-quadrate, rounded, very inequilateral, moderately 

 inflated. Anterior margin rounded, passing quickly into the ventral margin, 

 with which it forms a regular and continuous curve. Posterior margin more or 

 less truncated, slightly or moderately convex, usually oblique, and forming an 

 obtuse angle with the postero-dorsal margin. Umbones large, broad, anterior. 

 A more or less distinct carina passes from the umbo to the postero-ventral 

 angle, cutting off a postero-dorsal area, which slopes rather rapidly to the posterior 

 margin. Lunular region more or less depressed, not limited. Escutcheon narrow, 

 deep, limited by a sharp carina. 



Ornamentation consists of growth-lines. 



In the right valve the posterior cardinal tooth is large and divided ; the 

 median cardinal is smaller than the anterior cardinal, and in most forms adjoins 



1 Pictet and Eoux, 'Moll. Foss. Gres verts de Geneve' (1852), p. 444, pi. xxxiv, fig. 1. 

 3 ' Terr. Cret. de Ste. Croix ' (1865), p. 221. 



3 ' Pal. Franc. Terr. Cret.,' vol. iii (1847), pp. 98, 759, pi. cclxxi. Afterwards referred to C. 

 bemensis, Leymerie, see d'Orbigny, ' Prodr. de Pal.,' vol. ii (1850), p. 77. 



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