230 STALK-EYED CRUSTACEA 



2. Sylviocarcinus. 



SylviocarciiiJis . . . Rathbun, H. Milne Edwards, 



Ortmann. 



The carapace has an uneven surface, often with a 

 blunt ridge running transversely or obliquely across the 

 branchial region ; lateral teeth dentate or spiniform. 

 Eyes not diminishing in size towards their tips. Lower 

 margin of orbit with a spine at inner angle ; remainder 

 of margin tuberculate. Buccal angle usually not armed. 

 The last joint of the first three pairs of walking legs is 

 styliform, thin, and quadrangular ; the last pair of walking 

 legs is compressed, with the last joint flat but narrow ; 

 its border is hairy. 



I. Sylviocarcinus devillei. 



Sylviocarcimts devillei . . H. Milne Edwards. 



Carapace slightly convex ; regions not well marked ; 

 almost circular. The front, wide, advanced, almost hori- 

 zontal, is divided into two rounded lobes, with a feebly 

 tuberculated edge. The lateral borders have five teeth, 

 not counting the external orbital angle ; the last tooth 

 is spiniform ; the other teeth are more or less flat, with 

 a broad base. The internal antennae are folded trans- 

 versely into deep fossae. The antero-internal angle of 

 the third joint of the external maxillipedes is produced ; 

 the next joint (the fourth) is triangular. The last joint 

 of the last pair of legs is broader and flatter than the last 

 joint of the other three pairs of walking legs, which is 

 styliform. 



Range. — Brazil. 



