38 CRETACEOUS LAMELLIBRANCHIA. 
Measurements : 
(1) (2) 
Length ? ; 5 ; 35 : . 21mm. 
Height ‘ : F : : 21 ; xe ot Ae oe 
Umbo to postero-ventral angle. 47 {) “i lO. 
(1) Perna-bed, Atherfield. (2) Crackers, Atherfield. 
Affinities—This differs from all other Cretaceous species with which I am 
acquainted. The form of the shell and the character of its ornamentation agree 
closely with the recent Scaphula, but since in our species the interior is unknown, 
I refer it with considerable doubt to that sub-genus. 
Type.—In the Museum of the Geological Society (No. 2152), from Peasmarsh. 
Distribution.—Atherfield Beds of Sevenoaks, Peasmarsh, East Shalford, and 
Redcliff (Isle of Wight). Crackers and Perna-bed of Atherfield. 
2. Upper and Lower Cretaceous Species. 
BaRBATIA MARULLENSIS (@’Orbigny), 1844. Plate VII, figs. 4, 5 a—d, 6 a, 4, 7. 
1844. Anca Marutiensis, A. d’Orbigny. Pal. Frang. Terr. Crét., vol. iii, p. 205, 
pl. cecx, figs. 8—5. 
1854. — — J. Morris. Cat. Brit. Foss., ed. 2, p. 185. 
85 — G. Cotteau. Moll. Foss. de l’Yonne, p. 87. 
1866. — — F. J. Pictet and G. Campiche. Foss. Terr. Crét. de 
Ste. Croix (Mater. Pal. Suisse, ser. 4), pt. 3, 
pp. 432, 468, pl. exxx, figs. l—4. 
1867. — — P. de Loriol. In A. Favre, Recherch. géol. dans 
Savoie, &c., vol. i, p. 382. 
1869. — — P. de Loriol and V. Gilliéron. Mon. pal. et strat. de 
Vétage Urgon. inf. du Landeron (Mém. Soc. 
Helvét. des Sci. Nat., vol. xxiii), p. 16, pl.i, fig. 13. 
1871. — — F. Stoliczka. Paleont. Indica, Cret. Fauna S. India, 
vol. i, p. 842 (Barbatia). 
1883. — — W. Keeping. Foss., &c., Neoc. Upware and Brickhill, 
p. 114. 
Non 1850. Byssoarca MarkvuLuENsis, J. de C. Sowerby. In F. Diwon, Geol. Sussex, 
p. 3855, pl. xxviii, fig. 11. 
— 1878. — — Sowerby. Ibid., ed. 2, p. 385, pl. xxviii, fig. 11. 
Deseription.—Shell oblong, inequilateral, rather compressed. Anterior and 
posterior margins rounded, the postero-dorsal somewhat oblique ; ventral margin 
parallel to the dorsal. Umbones not prominent, rather close; carina near the 
