84 ALBIAX FOSSILS DISCOVERED AT OKEFORD FITZPAINE. 



D'Orbigny, very properly, altered the original name of this 

 shell on account of Lea's pre-occupation of the same for a recent 

 mollusc in 1833. 



EANGE OF SPECIES. Albian to Cenomanian. 



LOCALITIES. Folkestone, Cambridge, Chardstock, Devizes ; 

 Wissant, Ardennes, Meuse, Larrivour, St. Croix, &c. 



MOLLUSCA Lamellibrancldata. 

 CUCULL^EA CARINATA, J. Sowerby. 



[For synonomy see p. 72.] 



This species is represented by two fairly well-preserved examples. 

 The valves, attached in both cases, show a highly-ornamented test, 

 with the characteristic keeled and oblique posterior area. 

 The geographical distribution has been before alluded to. 



SYXCYCLONEMA ORBICULARIS, J. Sowerby. 

 P). iii., fig. 9. 



Pecten orbicularis, J. Sowerby : Mineral Conchology, 1817, 

 Vol. 2, PL 186, p. 193. 



Pecten laminosa, Mantell : Geology of Sussex, 1822, PL 26, 

 figs. 8 and 22, p. 128. 

 . Pecten membranaceus, 



Pecten orbicularis, Nilsson : Petrificata Suecana, 1827, PL 9, 

 fig. 16 ; PL 10, fig. 12, p. 23. Orbigny : Xavier Hommaire de 

 Hell's " Les Steppes de la Mer Caspienne," Paleontologie, 1844, 

 PL 6, fig. 6, p. 439 ; and Paleontologie Francaise, Terrains 

 Cretaces, Lamellibranchia, 1846, PL 433, figs. 14-16, p. 597. 



Pecten (Syncyclonema) orbicularis, Stoliczka : Mem. Geol. Surv. 

 India, Pelecypoda, 1871, pp. 426-428. 



Three specimens were obtained of this species at Okeford Fitz- 

 paine. The smallest (selected for figuring) is a lower valve in 

 which the chief details of the shell are fairly well expressed. It 

 is suborbicular, compressed, lenticular, and ornamented with 

 parallel, concentric, imbricating laminae ; the ears are small, 

 narrow, of nearly equal size, vertically striated, with their 



