LUCINA. 153 



found in the Lower Greensand 1 of Blackgang, Shanklin, and Parham Park. The 

 outline is nearly circular and the convexity small or moderate. The ornamenta- 

 tion consists of concentric ribs and flat interspaces. 



Lucina, sp. Plate XXIV, fig. 0. 



A specimen with the two valves united was obtained by the late C. J. A. 

 Meyer from the Lower Greensand (Ferruginous Sands) of Shanklin, and appears 

 to belong to a distinct species. The shell is regularly convex, slightly higher than 

 long, and the lunule is deeply depressed. The ornamentation consists of numerous, 

 small, regular, concentric ribs. 



Lucina? sculpta, Phillips, 1829. Plate XXIV, figs. 7—9. 



1829. Lucina sculpta, /. Philips. Geol. Yorks., pp. 122, 170, pi. ii, fig. 15 



(p. 252, ed. 3). 

 1844. A. d'Orbigny. Pal. Fran?. Terr. Cret., vol. iii, p. 118, 



pi. cclxxxiii, figs. 1 — 4. 

 1850. E. Eichwald. Zeitschr. d. deutsch. geol. Gesellseh., 



vol. ii, p. 471. 

 — A. d'Orbigny. Prodr. de Pal., vol. ii, p. 118. 



1854. /. Morris. Cat. Brit. Foss., ed. 2, p. 208. 



1862. /. G. Chenu, Man. de Concliyl., vol. ii, p. 119, fig. 571. 



1866. F. J. Pictet and Q. Campiche. Foss. Terr. Cret. Ste. 



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

 p. 291. 

 1871. — F. Stoliczka. Palaeout. Indica, Cret. Fauna S. India, 



vol. iii, p. 252. 

 1906. A. Wollemann. Die Biv. u. Gastrop. norddeutsch. Gaults, 



p. 277. 



Description. — Shell very convex, higher than long, with angular outline. 

 Antero-dorsal margin long, concave. Postero-dorsal margin long, convex. Angles 

 occur at the ventral limit of the lunule, at the junction of the anterior and ventral 

 margins, near the posterior part of the ventral margin, and at the ventral limit 

 and the middle of the escutcheon. Umbones high, prominent, sharp, curved 



1 Lucina arduennensis, d'Orbigny, and L. Dnpiniana, d'Orbigny, have been recorded by Topley 

 from the Lower Greensand of the Weald. I have not seen any specimens which could be identified 

 with those species. Two imperfect left valves from the Lower Greensand of Atherfield, now in the 

 Museum of the Geological Society, were referred by Forbes to L. globiformis, Leymerie. Without 

 1 ictler specimens it is difficult to determine the genus to which Forbes' specimens belong. See Forbes, 

 'Quart. Journ. Geol. Soc.,' vol. i. (1845), p. 240; Leymerie, 'Mem. Soc. geol. de France,' vol. v 

 (1842), p. 4, pi. iii, fig. 8. 





