2G0 CRETACEOUS LAMELLTBRANCHTA. 



Cuspin.vKiA u.\DU[,ATA {Sowerhi/), 1827. Plate XLIV, fig. 4. 



1827. NucuLA UNDULATA, J. df C. Soivefhi/. Min. Couch., vol. vi, p. 104, jil. dliv, 



fig- 3. 

 1854. Ne^ra ? — J. Morris. Cat. Brit. Foss., eil. 2, p. 216. 



1866. — —F.J. Picfef and G. Campiche. Foss. Terr. Cret. Ste. 



Croix (Mater. Pal. Suisse, ser. 4), p. 421. 

 1871. — — F. StoUckza. Palaeont. Indica, Cret. Fauna S. India, 



vol. iii, p. 322. 



Eemarlis. — A few .specimens resembling Sowerby's figure of G. utidulatd Lave 

 been found. They appear to differ from G. SabaucUana only in tlie less oblique 

 form of the shell and the more convex postero-ventral margin. More specimens 

 are needed in order to determine whether G. SaJiandidna and G. iimJulata are reall}' 

 distinct or only varieties of one species. 



Tijpe. — The type was preserved in pyrites, and came from Folkestone ; it was 

 formerly in the British Museum, but has now perished. 



Distrihution. — Gault of Folkestone. 



CusPiDAEiA PULCHKA (Sowi'rhi/), 1850. Plate XLIV, figs. .5, 6. 



1850. Leda pulchra, J. de C. Soirerbij in F. Bixon. Geol. Sussex, p. 346 (p. 382, 



ed. 2), pi. xxviii, fig. 10. 

 1864. — ? — J. Morris. Cat. Brit. Foss., ed. 2, p. 205. 

 1897. CuspiDARiA CAUDATA, H. Woods. Quavt. Journ. Geol. Soc, vol. liii, p. 393, 



pi. xxviii, figs. 19, 20. 



Description. — Shell convex, with the posterior and antero-dorsal parts com- 

 pressed ; sub-triangular, oblique, somewhat inequilateral, highest in front of the 

 umbones. Dorsal margin nearly straight. Anterior margin slightly convex. 

 Antero-ventral margin rounded. Ventral margin curving upwards and passing 

 gradually into the posterior margin, which forms an acute angle with the postero- 

 dorsal margin. Umbones pointed, curved inwards and slightly backwards. 

 Ornamentation consists of regular, concentric ribs which become indistinct on the 

 antero-dorsal and postero-dorsal parts. 



Measurements ; 



(1) (2) 



mm. 



