396 STALK-EYED CRUSTACEA 



dentate ; teeth usually well developed. Eyes of moderate 

 size, the orbits deep. First pair of legs moderately 

 flattened ; the fifth joint short, and usually provided with a 

 single projecting lobe near the proximal end of the 

 internal margin ; the fingers frequently contorted. 

 Walking legs with the last joint short and robust, 

 terminating in a single claw. First joint of the antennal 

 peduncle more or less produced and joined to the margin 

 of the carapace ; the second joint placed at a distance from 

 the orbit. 



Range. — Temperate and tropical seas ; in shallow and 

 deep water. 



I. Porcellana robertsoni. 



Porcellana robertsotii . . . Henderson. ■ 



Carapace smooth, though minutely punctate ; numerous 

 transverse lines on the posterior branchial areas, and a few 

 hairs on gastric region. Front tridentate, median tooth 

 broadest and most prominent, slightly deflexed and with 

 a shallow median groove on upper surface. First joint of 

 antennal peduncle forms a flattened process below the 

 orbit ; its flagellum is of moderate length. First pair of 

 legs of moderate size, upper surface densely pubescent ; 

 fourth joint has a flattened lobe on inner and distal 

 margin which overlaps the fifth joint ; fifth and sixth 

 joint have their upper surface crossed by numerous short 

 and ill-defined lines ; the inner margin of the fifth has a 

 single acute tooth of large size near its proximal end. 

 The inner border of the sixth is short and strongly 

 curved. Walking legs are short and strongly pubescent ; 

 terminal joint short and moderately curved, with yellow 

 tip. 



Range. — West Indies ; in deep water. 



