60 
HISTORY OF BRITISH CRUSTACEA. 
cies of the allied genus Brachynotus is found in the Medi- 
terranean ; it has been found under the tail of the Testudo 
Midas, or Turtle. 
Tribe 4. OXYSTOMATA. 
Tam. LEUCOSIAD JS, Leach . 
Carapace more or less circular in general outline ; the 
outer jaw-feet, when closed, triangular, and sharp-pointed 
in front (Plate IY. fig. 3 a). No branchial openings before 
the front legs ; outer antennae rudimentary. 
This family and the following belong to the tribe Oxy- 
stomata, or Pointed-mouthed Crabs, so called from most of 
the Crustacea included in it having the mouth-apparatus 
triangular, the front portion being narrow and pointed. 
The family Leucosiadm has been lately monographed by 
the able hand of Professor Bell, in the ‘Linnean Transac- 
tions/ The family is very feebly represented in our seas ; 
many of the exotic species and genera are very striking and 
peculiar Crabs. 
Gen. 19. EBALIA Leach. 
Carapace knobbed, its sides slightly dilated, its general 
form rhomboidal ; outer jaw-feet with the palpus not dilated 
