286 



Antediluvian Zoology and Botany. 



Afstacus.^ — This genus is more extensively distributed than 

 that of Cancer. We can only at present arrange them, with- 

 out distinguishing species, as follows : — 



In tlie lias, 2 species ; inferior oolite, 1 ; Stonesfield slate, 

 Kelloways rock, Oxford clay, 1 ; coral rag, 2 ; gault and 

 Speetbn clay, 2; upper green sand, 1; chalk, 2; London 

 clay, 1 or 2 ; crag, 1. 



Lobster from Sheppy. Whether the figure named by the author of I cones FosslUum SectUes 

 as fanccr tuberculatus, fig. 54., from the same locality, is similar to this specimen, cannot be 

 determined, on account of the extreme coarseness of his plate. 



Cancer. — Some varieties are stated to occur in the Stones- 

 field slate; in the gault, 4 species; chalk, 2 species; Lon- 

 don clay, 3 or 4- species ; perhaps in the inferior oolite, 2. 



These genera, particularly the crabs, are found in great 

 numbers, although rarely perfect, upon the beach beneath the 

 Sheppy clay cliffs. None of the fossil Crustaceajiave been 

 ascertained to be identical with existing species. We possess 

 no complete English work on the fossil Crustacea ; but refer, 

 for further illustration of this branch of natural history, to the 

 Histoire Naturelle des Criistaces Fossiles, })ar M. Desmarest. 



Crab from Sh^py. Pro- 

 bably not the same as 

 Cancer LeachiV of Desma- 

 rest, pi. viii. fig. 5, fi. 



