CYPRINA. 181 



Remarks. — Only two specimens have been seen, both of which were collected 

 by Mr. H. Keeping, and are now in the Sedgwick Museum, Cambridge. 

 Distribution. — Folkestone Beds, near Copt Point, Folkestone. 



Antjioxva, sp. Plate XIX, fig. 6. 



Description. — Shell elongate, tapering posteriorly, very inequilateral, greatly 

 compressed. Anterior margin convex, rounded, passing gradually into the slightly 

 curved ventral margin. Posterior margin short, truncate, forming angles with the 

 ventral and dorsal margins. Postero -dorsal margin long, slightly concave. Umbones 

 sharp, anterior. Carina indistinct. Postero-dorsal area narrow. Surface of shell 

 smooth, except for growth-lines, which are rather more distinct near the anterior 

 margin than elsewhere. 



Length, 38 mm. Height, 15 mm. 



Affinities. — This species appears to be closely allied to A. Comueliana (d'Orbigny), 1 

 but does not possess the concentric ribs near the anterior margin. It differs from 

 A. cantiana, sp. nov., in the greater length of the anterior part of the shell, the 

 greater curvature of the anterior margin, the larger apical angle, and the absence 

 of concentric ribs. 



Remarks. — A left valve is the only specimen seen. 



Distribution. — Lower Greensand (Crackers) of Ather field. 



Family-CYVRINIDM, Lamarck. 

 Genus — Cypbina, Lamarck, 1818. 



(' Anim. sans Vert.,' vol. v, p. 556) 



Cypkina Saussuri (Broiujuiart), 1821. Plate XIX, figs. 7 — 13. 



1821. Donacites Saussuri, A. Brongniart. Ami. des Mines, vol. vi, p. 555, pi. 



vii, fig. 5 (11011 Venus Saussurii, 

 Goldfuss, 1840). 

 1854. Mactra saussuri, E. Bevevier. Mem. geol. suv la Perte-du-Rhone, p. 24. 

 1856. Cyprina Saussuri, F. J. Pidet and E. Benevier. Foss. Terr. Aptien 



(Mater.Pal. Suisse, 

 ser. 1), p. 73, pi. 

 viii, figs. 1 — 2. 



1 For references see p. 130, footnote 3. 



