40 CRETACEOUS LAMELLIBRANCHIA. 



V run i, is. — This species is easily distinguished by the very strong radial ribs. 

 The English specimens, which at present are known from three localities only, are 

 not well-preserved, so that the details of the ornamentation cannot be seen clearly. 



The occurrence of L. Reicltenbachi in England (from Wilmington) was first 

 noted by Mr. Jukes-Browne in 1898. The only specimens which I have seen are 

 now in the Museum of Practical Geology and the Sedgwick Museum. 



Types. — From the Lower Planer (Cenomanian) of Plauen near Dresden. 



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

 Chloritic Marl of Chard. Cenomanian Sandstone of Wilming-ton. 



Lima (Mantellum), sp. Plate VI, fig. 16 a, b. 



Remark?. — A small specimen in the Museum of Practical Geology (No. 789G) 

 is similar in form and in the general character of its ornamentation to L. canta- 

 brigiensis (see p. 37), but the main ribs are not so strongly developed, the 

 interspaces are natter, and the intermediate ribs are more prominent. It differs 

 from L. intermedia in its more distinctly oblong form and in the occurrence of 

 well-developed intermediate ribs. 



This specimen resembles closely the lowest of the three figures referred to Lima 

 elegans by Guer anger. 1 



Distribution,. — Chloritic Marl of Chardstock. 



Sub-genus — Ctenoides, H. and A. Adams, 1858 (ex Klein, 1753). 

 ('Genera of Eeceut Mollusca,' vol. ii, p. 557). 



Lbia (Ctenoides) rapa, d'Orbigny, 1847. Plate VI, figs. 17a— c. Plate VII, fig. 1. 



Text-fig. 6. 



1847. Lima eapa, A. d'Orbigny. Pal. Franc. Terr. Oct., vol. iii, p. 546, pi. ccccxix, 



figs. 1-4. 

 1850. — — A. d'Orbigny. Prodr. de Pal., vol. ii, p. 166. 



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

 land, p. 188. 

 1855. - G. Cotteau. Moll. Foss. de l'Youne, p. 101. 



1867. — — E. Gucranger. Album Palcout. de la Sarthe, p. 19, pi. xxiv, 



figs. 16, 17. 



Album Palcout. de la Sarthe ' (1867), p. 18, pi. xxiv, fig. 1. 



