50 CRETACEOUS LAMELLIBRANCHIA. 



which are more or less imperfect, but after an examination of specimens of 

 L. subaequilateralis from Le Mans in the Museum of Palaeontology at Paris I am 

 inclined to refer them to that species. In the specimens from Le Mans the 

 number of ribs is sometimes greater than is shown in D'Orbigny's figure, also the 

 ears may be less sharply separated from the valve, and in one case the hinge-line 

 was seen to be relatively longer. 



Types. From the Cenomanian of Le Mans. The specimens here figured are 

 in the British Museum. 



Distribution. Upper Greensand (zone of Pecten asper) of Warminster. 



LIMA (LIMATULA) DECUSSATA, Gold/uss, 1836. Plate VII, figs. 18a, b, 19, 20 a, b. 



1836. LIMA DECUSSATA, A. Goldfuss. Petref. G-erm., vol. ii, p. 91, pi. civ, fig. 5. 



1837. PLAGIOSTOMA GRANULATUM, W. Hisinger. Lethaea Suecica, pi. xv, fig. 7. 

 1841. LIMA DECUSSATA, F. A. Romer. Die Verstein. d. nord-deutsch. Kreidegeb., 



p. 55. 



1846. A. E. Reuss. Die Verstein. der bohm. Kreideformat., 



pt. 2, p. 32, pi. xxxviii, fig. 15. 



1847. SEMISULCATA, J. Muller. Petref. der Aachen. Kreidef., pt. 1, p. 33. 

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



SEMISULCATA, R. Kner. Verstein. v. Lemberg (Haidinger's Natur- 



wiss. Abhandl., vol. iii, pt. 2), p. 29. 



DECUSSATA, A. Alth. Greogn.-palseont. Beschreib. v. Lemberg (Haid- 



inger's Naturwiss. Abhandl., vol. iii, pt. 2), 

 p. 241. 



SEMISULCATA, Allh. Ibid., p. 242. 



1863. DECUSSATA, A. v. Strombeck. Zeitschr. d. deutsch. geol. Gesellsch., 



vol. xv, p. 151. 



? 8. Placketko. Das Becken von Lemberg (Jahresb. d. 



k. zweite Ober-Gymnas. in Lemberg), 

 p. 20, pi. i, fig. 19. 



1866. K. A. Zittel. Die Bivalven d. Gosaugeb. (Denkschr. d. 



k. Akad. d. Wissensch. Wien, vol. xxv), 

 pt. ii, p. 105, pi. xvi, fig. 4. 



1869. E. Favre. Moll. Foss. de la Craie de Lemberg, p. 136. 



1870. F. J. Pictet and G. Campiche. Foss. Terr. Oct. Ste. 



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

 p. 174. 



1871. EADULA (LIMATULA) DECUSSATA, F. Stoliczka. Palaeont. Indica, Cret. 



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



1888. LIMA DECUSSATA, A. Peron. L'Hist. du Terr, de Craie, p. 145, pi. i, fig. 18. 



1889. E. Holzapfel. Die Mollusk. Aachen. Kreide (Palseon- 



tographica, vol. xxxv), p. 242, pi. xxvii, 

 fig. 4. 



