I86 Antediluvian Zooloey and Botany. 
iS Ly 
A’stacus.—'This genus is more extensively distributed than 
that of Cancer. Wo e can only at present arrange them, with- 
out distinguishing species, as follows : — 
In the lias, 2 species; inferior oolite, 1; Stonesfield slate, 
Kelloways rock, Oxford clay, 1; coral rag, a eault and 
Speeton clay, 2; upper green sand, 1; chalk, 2; London 
day, lor’? > crac, 1. 
to 
Lobster from Sheppy. Whether the figure named by the author of Icones Fosstlium Séctiles 
as Cancer tuberculatus, fig. 54., from the same locality, is similar to this specimen, cannot be 
determined, on account of the extreme coarseness of his plate. 
Cdncer.— 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, pi articularly the crabs, are found in great 
numbers, although rarely perfect, upon the beach beneath the 
Sheppy clay cups. None of the fossil Crustacea have 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 Crustaces Fossiles, par M. Desmarest. 
Crab from Sheppy. Pro- 
bably not the same as 
Cancer Leachié of Desma- 
rest, pl. vill. fig. 5, 6 
