ANATINA. 239 
AnatiINna (Cercomya) curaitis, Pictet and Campiche, 1865. Plate XX XIX, figs. 2—4. 
1855. Anatina Rosrnatpina, F. J. Pictet and EH. Renevier. Foss. Terr. Aptien 
(Matér. Pal. Suisse, ser. 1), p. 63, pl. vii, fig. 1. 
(Non A. Robinaldina, VOrbigny, 1845.) 
1865. = curaitis, F. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Matér. Pal. Suisse, ser. 4), 
p. 105, pl. evii, figs. 6—8. 
1870. — (Cercomya) Gurartis, F. Stoliczka. Paleont. Indica, Cret. Fauna 
8. India, vol. ii, p. 74. 
Description.—Shell elongate, compressed, mequilateral, highest in front of the 
umbones, tapering posteriorly. Anterior margin rounded. Umbones incon- 
spicuous, with a carina extending to the posterior extremity. A very shallow 
sulcus passes from the umbo obliquely forwards across the valve. In front of this 
sulcus the ornamentation consists of narrow, sharp, concentric ribs separated by 
broad interspaces ; both ribs and interspaces are crossed by numerous radial rows of 
very small pointed projections. Behind the sulcus the concentric ribs become less 
distinct or represented by growth-rings only. 
Affinities —This species is alhed to A. (Cercomya) Robinaldina, @Orbigny,' but 
the posterior part of the shell is more elongate. 
Remarks.—I have seen only three examples of this species. Pictet and 
Campiche state that the part of the shell just in front of the carina is ornamented 
with radial rows of punctate striz ; these are not seen on the English specimens, pro- 
bably on account of their somewhat imperfect preservation. One of our specimens 
(Plate XX XIX, fig. 3) agrees very closely, both i the form of the shell and in the 
character of the ornamentation, with the figure given by Pictet and Renevier; the 
others (figs. 2, 4) approach more nearly the examples figured by Pictet and 
Campiche, but the anterior part of the shell is rather higher. 
Type.—From the Aptian of the Perte-du-Rhéne. 
Distribution.—Lower Greensand (Crackers) of Atherfield. 
Awnatina (Cercomya), sp. Plate XXXIX, fig. 5a, b. 
Description.—Shell very long, compressed, considerably inequilateral, highest 
in front of the umbones; posterior part tapering, and curved upwards. Anterior 
margin rounded; ventral margin convex; postero-dorsal margin concave. Um- 
bones curved posteriorly, with a carina and a shallow furrow extending to the 
«Pal. Franc. Terr. Crét.,’ vol. iti (1845), p. 374, pl. ccelxx, figs. 6—8. 
