LIMA. 5 



Remarks. I have seen one example only ; it consists of both valves, but with 

 the posterior margin imperfect. 



Type. In the Museum of the Ventnor Institute. 



Distribution. Upper Greensand, chert beds (zone of Pecten asper) of the Isle 

 of Wight. 



LIMA SUBOVALIS, Sowerby, 1836. Plate II, figs. 3, 4*a, b, 5a, &, 6a, b, 7 a, b. 



1836. LIMA ? SUBOVALIS, /. de C. Sowerby. Trans. G-eol. Soc., ser. 2, vol. iv, 



pp. 359, 342, pi. xvii, fig. 21. 

 1839. ASPEEA, H. B. Geinitz. Char. d. Schicht. u. Petref. des silchs. 



Kreidegeb., pt. 1, p. 23 (partim). 

 ? 1847. STTBOVALIS, A. d'Archiac. Mem. Soc. geol. de France, ser. 2, vol. ii, 



p. 309. 

 OBNATA, A. d'Orligny. Pal. Fran$. Terr. Cret., vol. iii, p. 551, 



pi. ccccxxi, figs. 6 10. 

 1850. Prodr. de Pal., vol. ii, p. 167. 



H. B. Geinitz. Das Quadersandst. oder Kreidegeb. in 



Deutschland, p. 192. 



1867. E. Gueranger. Album Paleont. de la Sarthe, p. 19, 



pi. xxiv, figs. 7, 12. 



1869. SUBOVALIS, F. J. Pictet and G. Campiche. Foss. Terr. Cret. Ste. 



Croix (Mater. Pal. Suisse, ser. 5), 

 p. 168. 



1870. OBNATA, Pictet and Campiche. Ibid., pp. 169, 173. 



1871. EADULA (ACESTA) OBNATA, F. Stoliczka. Palaeont. Indica, Cret. Fauna S. 



India, vol. iii, p. 414. 



1872. LIMA OBNATA, H. B. Geinitz. Das Elbthalgeb. in Sachsen (Palseontogra- 



phica, vol. xx, pt. 1), p. 205, pi. xlii, 

 figs. 16, 17. 



? 1877. A. Peron. Bull. Soc. geol. de France, ser. 3, vol. v, p. 502. 



1877. RAULINIANA, A. J. Jukes-Browne. Quart. Journ. Geol. Soc., vol. 



xxxiii, p. 502, pi. xxi, fig. 2. 



1893. ORNATA, R. Michael. Zeitschr. d. deutsch. geol. Gesellsch., vol. xlv, 



p. 234. 



Non 1852. A. Buvignier. Statist, geol., etc., de la Meuse, Atlas, p. 23, 



pi. xviii, figs. 1719. 



Description. Shell compressed, ovate or subtrigonal, oblique, considerably 

 higher than long, with the ventral and posterior margins rounded. Apical angle 

 about 74. Umbones small, close together. Anterior area rather small, depressed, 

 limited by a ridge, ornamented with ribs separated by broader grooves. 



Ornamentation consists of numerous (65 to 70) fairly strong, rounded ribs of 



