44 CRETACEOUS LAMELLTBRANCHIA. 



Types. From the Senonian of Maestricht. D'Orbigny's specimens came 

 from the Cenomanian of Le Mans and from the Senonian of Tours and Loir-et- 

 Cher. 



Distribution. Cenomanian (Bed 11) of Dunscombe. 



LIMA (CTENOIDES) DIVARICATA, Dttjardin, 1837. Plate VII, figs. 4ad, 5, 6a, b. 



1837. LIMA DIVAKICATA, F. Dujardin. Mem. Soc. geol. de France, vol. ii, p. 227, 



pi. xvi, fig. 7. 



1840. ARCUATA, If. B. Geinitz. Char. d. Schicht. u. Petref. des sachs. 



Kreidegeb., pt. 2, p. 57, pi. ix, fig. 7. 



1841. DIVARICATA, _F. A. Rom&r. Die Verstein. d.uord-deutsch. Kreidegeb., 



p. 58. 

 1850. A. (VOrbigny. Prodr. de Pal., vol. ii, p. 248. 



GRANOSA, /. de C. Sowerby iu F. Dixon. Geol. Sussex, p. 347 (p. 382, 



ed. 2), pi. xxviii, figs. 24, 25. 



1854. /. Morris. Cat. Brit. Foss., ed. 2, p. 171. 



1859. MYTILUS? SPECTABILIS, /. M tiller. Petref. der Aaclieu. Kreidef., supple- 

 ment., p. 10, pi. vii, fig. 10. 



1870. LIMA GRANOSA, F. J. Pictet and G. Campiche. Foss. Terr. Cret. Ste. Croix. 



(Mater. Pal. Suisse, ser. 5), p. 169. 

 DIVARICATA, Pictet and Campiche. Ibid., pp. 171, 173. 



1871. RADULA (CTENOIDES) GRANOSA, F. Stoliczka. Palseont. Indica, Cret. 



Fauna S. India, vol. iii, p. 415. 

 DIVARICATA, Stoliczka. Ibid., p. 415. 



1872. LIMA DIVARICATA, H. B. Geinitz. Das Elbthalgeb. in Sachsen (Pal- 



aeontographica, vol. xx, pt. 1), 

 p. 205, pi. xlii, fig. 18. 

 1889. A. Fritsch. Stud, hn Gebiete der bohrn. Kreideformat. : 



IV, Teplitz. Schicht., p. 83, fig. 77. 

 E. Holzapfel. Die Mollusk. Aachen Kreide (Palseon- 

 tographica, vol. xxxv), p. 241, 

 pi. xxvii, fig. 7. 



1897. GRANOSA, H. Woods. Quart. Journ. Geol. Soc., vol. liii, p. 383. 

 1902. DIVARICATA, M. v. Pul/y. Mittheil. Jahrb. d. k. ungarisch. geol. 



Anstalt, vol. xiii, p. 274, pi. xx, fig. 4. 



Description. Shell convex, flattened, the anterior marginal part sloping 

 steeply, the posterior part more gradually ; outline rather variable, more or less 

 ovate or approaching to oblong, considerably higher than long, only slightly 

 unsymmetrical. Umbones rather small, not much incurved. Ears relatively 

 short and high, not sharply limited ; the anterior larger than the posterior. 



Ornamentation consists of numerous small radial ribs which diverge from a 

 median or nearly median line or sometimes in part from two lines forming an 



