86 ALBIAN FOSSILS DISCOVERED AT OKEFORD FITZPAINE. 



number of smooth and ribbed forms which are very distinctly 

 sinuated beneath the anterior ear, and consequently its use 

 would be more adapted for Tertiary and Recent species. 

 Another of Meek's shells called Entolium,* founded on Pecten 

 demissus of Phillips, a Jurassic species, resembles in so striking 

 a manner the features of our Cretaceous specimen, P. orlicularis, 

 that, restricted to the type mentioned, it might well be amalgamated 

 with the Syncyclonema of an earlier date, 



Quenstedt's P. cornutum is sometimes quoted as the type of 

 Entolium, a species, I believe, never referred to by Meek, 

 and therefore not acceptable. Besides, P. cornutum is internally 

 ornamented with radiating costse, and consequently more nearly 

 related to Amussium ; there are no internal rays to Pecten demissus. 

 With this explanation I must withdraw Entolium, under which I 

 listed orlicularis in my former paper, and substitute Syncyclonema. 



RANGE OF SPECIES. Albian to Turonian. 



LOCALITIES. Folkestone, Black Ven, Devizes, Warminster, 

 Blackdown, Cambridge, near Dover, Bingham's Melcombe, 

 Norfolk, Lincolnshire, &c. ; Ardennes, Meuse, Savoy, Seine- 

 Inferieure, Basses-Alpes, Yonne, Sweden, Germany, &c. 



PECTEN GALLIENNEI, Orbigny. 

 PI. iii., fig. 10-10a. 



Pecten Galliennei, Orbigny : Paleontologie Franchise, Terrains 

 Cretaces, Lamellibranchia, 1846. Barrois : Bull. Soc. Geol. 

 France, 1875, Ser. 3, Vol. 3, p. 227. 



The only specimen obtained consists of an impression in the 

 clay of a right valve, which, after a careful squeeze in wax, has 

 disclosed an elegantly-formed shell exhibiting the unmistakable 

 sculpture of this species. 



It is slightly convex and very unequally auricled ; surface 

 ornamented with from thirty to forty smooth, elevated, flattened, 

 radial costae variable in size and crossed by numerous obscure, 



* Geological Survey, California, Geology, Vol. i., 1865, Appendix B., 

 p. 478, PI. i, figs. 6, 6a. 



