60 HISTORY OF BRITISH CRUSTACEA. 



cies of the allied genus Bracliynotus is found in the Medi- 

 terranean ; it has been found under the tail of the Testudo 

 Midas, or Turtle. 



Tribe 4. OXYSTOMATA. 

 Fam. LEUCOSIABJH, Lead. 



Carapace more or less circular in general outline; the 

 outer jaw-feet, when closed, triangular, and sharp-pointed 

 in front (Plate IV. fig. 3 a). No branchial openings before 

 the front legs ; outer antennas 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 Leucosiadce, 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 



