182 CRETACEOUS LAMELL1BRAINCHIA. 



DosiNiorsis oaperata (Sowerby), 1826. Plate XXVIII, figs. 7—10. 



1826. Venus capekata, J. de C. Sowerby. Min. Couch., vol. vi, p. 31, pi. dxviii, 



figs. 1-3. 

 1850. A. d'Orbigny. Prodr. de Pal , vol. ii, p. 159. 



1854. Ctthehea - /. Morris. Cat. Brit. Fuss., ed. 2, p. 200. 



18G5. Venus capekata, F. J. Pictel and G. Campiche. Fuss. Terr. Cret. Ste. 



Croix (Mater. Pal. Suisse, ser. 4), 

 p. 189. 

 1868. A. Briii rt and F L. Cornet. Meule de Bracquegnies 



(Mem. cour. et Mem. des Sav. 

 (Strangers, vol. xxxiv), p. 74, pi. 

 vii, figs. 6 — 8. 

 1870. — F. Stolicz/ca. Palaeont. In<lica, Cret. Fauna S. India, 



vol. iii, p. 160 (Caryatis). 



? Non 1845. — A. d'Orbigny. Pal. Franc Terr. Cret,, vol. iii, p. 445, 



pi. ccclxxxv, fi»s. 9, 10 ( V. uniformis, 

 Prodr. de Pal., vol. ii, p. 236). 



Description. — Shell oval, convex, moderately or considerably inequilateral; 

 length rather greater than height. Antero-dorsal margin concave. Anterior 

 margin rounded, passing gradually into the convex ventral margin. Posterior less 

 convex than the anterior margin, sometimes subtruncate. Postero-dorsal margin 

 long, slightly convex. Umbones prominent, curved anteriorly. Lunule ovate. 

 Pallial sinus rather large, sub-angular. Ornamentation consists of strong, regular, 

 concentric ribs. 



Hinge : In the right valve three stout cardinals separated dorsally, the anterior 

 and median being close together and nearly vertical, the posterior oblique and 

 divided by a longitudinal groove ; there is an anterior elongate pit and a strong 

 posterior lateral tooth. In the left valve the median is the stoutest of the three 

 cardinals and is sometimes joined dorsally to the nearly vertical anterior cardinal; 

 the posterior cardinal is slender and very oblique ; the anterior lateral is strong, 

 elongate and parallel to the lunular margin. 



Measurements .• 



(4) (5) 



28 . 2G 

 24-5 . 22 

 (1—8) Blackdown. 



Remarks. — Internal casts from the Folkestone Beds of Pulborough were 

 referred to this species by Forbes. I have not seen any specimens which would 

 enable me to record the occurrence of l>. caperata in the Lower Greensand. 





(i) 



(2) 



(•'5) 



Length . 



34 . 



31 



. 30 



Height . 



30 -5 . 



2 ( .) 



. 20 



(«) 



(7) 



(8) 



25 



. 21 . 



15 mm 



23 . 



18-5. 



14 „ 



