LITHODES. 
69 
cimen in Billingsgate Market, amongst oysters from Whit- 
stable in Essex, in 1825. Mr. Ingall found it at Beachy 
Head, in Sussex, in 1848. Dr. Lukis told me, in 1856, 
that this species is taken in fine condition among the Chan- 
nel Islands. 
Bam. LITHODIAB JE, Leach. 
Carapace generally very much covered with spines, and 
ending in a longish beak. Inner antennse long and ex- 
posed ; the second, third, and fourth pairs of legs very long ; 
the fifth pair very short, and not used in walking. 
Gen. 24. LITHODES, Latr. 
Carapace triangular, covered with spines. Beak very 
long ; fifth joint of outer jaw-feet oblong, and seldom wider 
than the fourth. Carapace with its last ring not united in 
the same piece with the preceding, but free, and even mov- 
able. Hind legs very small, and folded back into the interior 
of the branchial cavities. 
There are five or six species of this distinct genus now 
known to naturalists. Mr. Dana"* describes one of these, 
* Crustacea of the United States Exploring Expedition, i. p. 428. 
