240 CRETACEOUS LAMELLIBRANCHIA. 
posterior extremity. On the anterior part of the shell the ornamentation consists 
of narrow, sharp, concentric ribs, which become less distinct on the median and 
posterior parts. 
an internal cast—has been seen. It resembles 
Remarks.—Only one specimen 
A, (Cercomya) gurgitis, but is more inequilateral and more elongate. 
Distribution.—Upper Greensand of the Isle of Wight. 
Awnatina (Cercomya), sp. Plate XX XIX, fig. 6. 
Imperfect specimens of a species of Anatina (Cercomya) have been found in the 
Upper Greensand of Warminster and in the Cenomanian (Bed 10) of Dunscombe, 
South Devon. In shape they resemble A. (Cercomya) pioducta, Zittel.' 
Genus—Turacia, Leach in H. M. D. de Blainville, 1824. 
(‘ Dict. Sci. nat.,’ vol. xxxii, p. 347.) 
Turacta Puinuipst, Romer, 1841. Plate XX XIX, figs. 7—9. 
1829. Mya prepressa, J. Phillips. Geol. Yorks., p. 121, pl. ii, fig. 8 (non M. depressa, 
Sowerby, 1823). 
1841. Turacta Puriuurpsiu, Ff. A. Rimer. Die Verstein. d. nord-deutsch. Kreide- 
geb., p. 74, pl. x, fig. 1. 
1850. — REcURVA, A. d’Orbigny. Prodr. de Pal., vol. ii, p.117.  (? T. sub- 
depressa, p. 74.) 
1854. = Puituiesi, J. Morris. Cat. Brit. Foss., ed. 2, p. 227. 
1865. -- — FJ. Pictet and G. Campiche. Foss. Terr. Crét. Ste. Croix 
(Matér. Pal. Suisse, ser. 4), p. 120. 
— — RECURVA, Pictet and Campiche. Ibid., p. 120. 
1870. — a F. Stoliczka. Paleont. Indica, Cret. Fauna S. India, 
vol. ili, p. 72 (Corimya ?). 
1875. — Puiurpsit, Phillips. Op. cit., ed. 3, p. 254, pl. ii, fig. 8. 
1900. — Puituipsi, A. Wollemann. Die Biv. u. Gastrop. d. deutsch. u. 
hollind. Neocoms (Abhandl. d. 
k. preussisch. geol. Land., n. F., 
pt. 31), p. 139, pl. vi, fig. 6. 
1905. — — H. Harbort. Die Fauna d. Schaumburg-Lippe’schen 
Kreidemulde (ibid., pt. 45), p. 77. 
1908. —- — Wollemann. Jahrb. d. k. preuss. geol. Landesanst., 
fur 1908; vol. xxx, p. 166? 
Description.—Shell thin, more or less ovate in outline, moderately convex, the 
right valve a little more convex than the left, shehtly inequilateral. Antero-dorsal 
1 «Die Bivalv. d. Gosaugeb.,’ pt. 1 (1864), p. 10 [114], pl. 1, fig. 6. 
