294 STALK-EYED CRUSTACEA 



I. Aratus pisoni. 



Aratus pisoni . H. Milne Edwards, Kingsley. 

 Sesarma pisoni . H. Milne Edwards. 

 Arata pinima . Pison. 



Carapace transversely arcuate, the branchial regions 

 obliquely plicate. Front vertical ; its margin two-lobed. 

 Fourth joint of first pair of legs triquetral ; the margins 

 toothed, the anterior one slightl-y expanded distally. 

 Fifth joint externally granulate. Hands granulate ; the 

 fingers ornamented with pencils of stiff black hairs. The 

 abdomen of the male is of the same shape as that of the 

 female but not so broad. 



Fourth joint of the external maxillipedes is short ; its 

 distal border truncate or excavated. 



The colours of the carapace is green posteriorly, with 

 a yellow tinge in front. The first pair of legs pink. The 

 walking legs green. 



Range. — British Guiana, Brazil, West Indies, West 

 Coast of Nicaragua, Florida. 



B, The fourth Joint of extetnial maxillipedes short, its 

 distal border truncate or excavated : — 



II. Cyclograpsus. 



Cyclograpstis . . Milne Edwards, Kingsley. 

 Guathochasnius . M'Leay 



Carapace depressed, sides arcuate, entire ; front about 

 half the width of the carapace. External antennae not 

 excluded from the orbit. The fifth joint of the external 

 maxillipedes articulates with the anterior margin of the 

 fourth. 



Range. — Pacific and Atlantic Oceans. 



