260 CRETACEOUS LAMELLIBRANCHIA. 
CUSPIDARIA UNDULATA (Sowerby), 1827. Plate XLIV, fig. 4. 
1827. Nucuna unpvuxata, J. de C. Sowerby. Min. Conch., vol. vi, p. 104, pl. dliv, 
fig. 3. 
1854. Nerara ? = J. Morris. Cat. Brit. Foss., ed. 2, p. 216. 
1866. — -- F. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Mater. Pal. Suisse, ser. 4), p. 421. 
1871. — — F. Stolickza. Paleont. Indica, Cret. Fauna S. India, 
vol. ili, p. 322. 
Remarks.—A few specimens resembling Sowerby’s figure of C. undulata have 
been found. They appear to differ from C. Sabaudiana only in the less oblique 
form of the shell and the more convex postero-ventral margin. More specimens 
are needed in order to determine whether C. Sabaudiana and C. widulata are really 
distinct or only varieties of one species. 
Type.—The type was preserved in pyrites, and came from Folkestone; it was 
formerly in the British Museum, but has now perished. 
Distribution.— Gault of Folkestone. 
CusPIDARIA PULCHRA (Sowerby), 1850. Plate XLIV, figs. 5, 6. 
1850. Lepa puncura, J. de CU. Sowerby in F. Dixon. Geol. Sussex, p. 346 (p. 382, 
ed. 2), pl. xxviii, fig. 10. 
s54 J. Morris. Cat. Brit. Foss., ed. 2, p. 205. 
1897. Cuspriparra cAupATA, H. Woods. Quart. Journ. Geol. Soe., vol. lii, p. 393, 
pl. xxviii, figs. 19, 20. 
Description.—Shell convex, with the posterior and antero-dorsal parts com- 
pressed ; sub-triangular, oblique, somewhat mequilateral, highest in front of the 
umbones. Dorsal margin nearly straight. Anterior margin slightly convex. 
Antero-ventral margin rounded. Ventral margin curving upwards and passing 
eradually into the posterior margin, which forms an acute angle with the postero- 
dorsal margin. Umbones pointed, curved inwards and shghtly backwards. 
Ornamentation consists of regular, concentric ribs which become indistinct on the 
antero-dorsal and postero-dorsal parts. 
Measurements : 
(1) (2) 
Length : ; 2d. : 22 mm. 
Height ; ; : 19 : ILS se 
Thickness ; 14 ib ore 
(1,2) Upper Chalk, Norwich. 
