296 STALK-EYED CRUSTACEA 



following joint is articulated in the middle of the distal 

 margin of the basal joint. The epistome is transverse. 

 The anterior margin of the buccal cavity is cristated. 

 The endostomian ridges are usually distinctly developed. 

 The external maxillipedes are rather small ; the fourth 

 joint is shorter than the third, but not narrower at the 

 base than that joint, distally truncated, and bears the 

 next joint at its summit ; the external appendage is 

 slender. The first pair of legs, in the male, is subequal 

 and moderately developed ; fourth joint trigonous ; fifth 

 joint and the palm usually granulated ; palm rounded 

 above and not dilated ; fingers distally excavate, with 

 corneous tips. Walking legs large and robust ; the 

 fourth joint compressed, with one or more spines on the 

 anterior margin ; terminal joint strongly spinuliferous. 

 The abdomen, in the male, broad, triangular, is seven- 

 jointed. 



Range. — Atlantic and Pacific Oceans. 



Synopsis of the Species. 



A. Hand granular, having above small tubercles. — 

 (P. depressa}) 



B. Hand smooth, having above two longitudinal 

 furrows. — (P. gracilis.) 



I. Plagusia depressa. 



Plagusia depressa . Say, Miers, De Haan, Desmarest. 



Plagusia tubercidata Lamarck, Miers. 



Cancer squamosus . Herbst. 



Cancer depressns . Fabric i us, Herbst. 



Grapsiis depressns . Latreille. 



Plagusia immaculata Lamarck. 



The carapace has above depressed tubercles but no 

 hairs. Front triangular and notched in centre. The 



