XANTHO. 
35 
Xantho rivulosa, Bisso, sp. Risso’s Crab . — Fingers 
grooved, brown, the bosses on the carapace more depressed 
than in the preceding. Four last pairs of legs furnished 
with hairs along their upper margin. Carapace yellowish, 
spotted with red. 
Common on the coast of Cornwall, under stones about 
low-water mark, where it was first ascertained to be British 
by Mr. Couch. 
Xantho tuberculata, Bell. — The carapace slightly de- 
pressed in front ; hands and wrists tuberculated, rugose ; 
* fingers nearly black, the movable one with three grooves ; 
third joint of the four last pairs of legs minutely toothed 
on the upper edge, the three terminal joints covered entirely 
with hair. 
Found by Mr. Couch in Mount's Bay, whence he first 
sent it to Professor Bell, who described and figured it in 
his classical work. 
* Gen. 9. GANCEB, I. 
Sides of carapace in front with many teeth or lobes placed 
close together. Movable stem of outer antennse springing 
from under the front, and completely out of the orbit, from 
which it is separated by a prolongation of the basilar joint 
