LUCINA. 153 



foiiiicl in the Lower Greensaiur nf Blackgaug, Shankliii, and I'liilunii I'ark. Tlie 

 outline is nearly circular and tlie convexity small or inoileratc. The ornamenta- 

 tion consists of concentric ribs and flat interspaces. 



LuciNA, sp. Plate XXIV, fig. G. 



A specimen witli the two valves united was ohfaincil by the late C. J. A. 

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

 to Ijelong 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. 



LiTfixA? scuLPTA, Phillip.% 1820. Plate XXTV, figs. 7—9. 



182D. Lpcina sculpta, /. Phillips. Geol. Yorks., j)}). 122, 170, pi. ii, fiij;. 1-'. 



(p. 252, C(l. 3). 

 1844. — —A. d'Orhi.jtiy. Pal. Frauy. Terr. Crct., v,.l. iii, p. 118, 



pi. ccLxxxiii, figs. 1 — 4. 

 18.50. — — E. Eichwald. Zeitschr. d. deutscli. geol. Gesollsch., 



vol. ii, p. 471. 

 — — — A. cVOrbifjni/. Prodr. de Pal., vol. ii, p. 118. 



18,54. — — /. Morris. Cat. Brit. Foss., ed. 2, p. 208. 



1862. — — J. G. Chenu. Man. de Conchyl., vol. ii, p. 110, fig. .571. 



1866. — — F. J. Fidet and G. Campiche. Foss. Terr. Cret. Ste. 



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

 p. 291. 

 1871. — — F. Stoliczka. Palseout. ludica, Cret. Fauna S. India. 



vol. iii, p. 252. 

 100(1. — — A. Wollemann. Die Biv. u. Gastrop. norddeutsch. Gaults, 



p. 277. 



Description. — Shell very convex, liighei' 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 Liicina arduennensis, d"Orl)igny, and L. Diqiiiiiam, d'Orbiguy, have heeu recorded by Toploy 

 from the Lower Greensand of the Weald. I have not seen any specimens which could l)o ideutifie<l 

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

 Museum of the Geologi.'al Society, were rcferre<l hy Forties to L. glnhifoniils, Ixnnierio. Witlmut 

 Letter specimens it is <lifficult to ■letermine the genus to which Forl«>s' six'cimens iiclong. See Forl)e.<*. 

 •Quart. ,T..„n,. Geol. Soc." vol. i. (1H1.5). p. 240; Leyjnerie. 'Mem. Sw. gcol. de France." v..I. v 

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



