ANATINA. 239 



Anatina (Cekcoxiya) (iriiciTis, ricfft and Cdm/iirln', 18()5. Plato XXXTX, figs. 2 — 4. 



1855. Anatina 'RoTiivsxi.intiK. F. J. Pidet and E. Renevier. Foss. Terr. Aj/tii'ii 



(Mati'r. Pal. Suisse, ser. 1), p. 63, pi. vii, li>,'. 1. 

 (Nou A. Robinaldina , d'Orbigny, 1845.) 

 1865. GURGiTis, F. J. Pictet and G. Campiche. Fo.ss. Terr. Cri't. Ste. 



Croix (Mat('r. Pal. Suisse, ser. 4), 

 p. 105, pi. cvii, figs. 6—8. 

 1870. — (Cercomya) GDRGiTis, J'. <S7o/iC2/.-a. Palaeont. Iiiilica, Cn-t. Fauna 



S. ludia, vol. iii, ji, "4. 



Description. — Shell elongate, compressed, inequilateral, highest in front of the 

 umbones, tapering posteriorly. Anterior margin rounded. Urabones incon- 

 spicuous, with a carina extending to the postei'ior extremity. A very shallow 

 siilcus 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 riljs become less 

 distinct or represented by growth-rings only. 



Affinities. — This species is allied to A. (Cercomya) Bohinahliua, d'Orbignj-,' but 

 the posterior pai"t of the shell is more elongate. 



Bemarl's. — 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 striae ; these are not seen on the English specimens, pro- 

 bably on account of their somewhat imperfect preservation. One of our specimens' 

 (Plate XXXIX, fig. 3) agrees very closely, both in 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 nearl_y the examples figured Ky Pictet and 

 Campiche, but the anterioi* part of the shell is rather higher. 



Tupe. — From the Aptian of the Pcrte-du-Rlione. 



Distrilmtion. — Lower Greensand (Crackers) of Atherfield. 



Anatixa (Cercomya), sp. Plate XXXIX, fig. oa, h. 



Description. — Shell very long, compressed, considerably inequilateral, highest 

 in front of the umbones; posterior \r,\v\ tapering, and curved upwards. Anterior 

 margin rounded; venti-d niai'gin convex; pcstero-dorsal margin concave. Um- 

 bones curved posteriorly, with a carina and a shallow furrow extending to the 



1 ' Pal. Franc. Terr. Crct.,' vol. iii (1845), p. 374, pi. ccclxx, figs. 6—8. 



