STALK-EYED CRUSTACEA 259 



Section II. Carcinoplacinae. 



Carciiioplaciiiu' . . Milne Edwards, Miers. 



The antero-lateral margins of the carapace are usually 

 dentate or spinose ; the abdomen of the male completely 

 conceals the sternum at the base. 



3. Geryon. 



Geiyon Kroyer, Miers. 



CJialcepiis (?) . . . . Gerstacker. 



Carapace cancroid in form, moderately convex, slightly 

 broader than long ; the antero-lateral margins shorter than 

 the postero-lateral margins, and armed normally with 

 three spines, including the spine or tooth at the external 

 angle of the orbit, which is sometimes less developed ; the 

 intermediate spines (the second and fourth of the normal 

 series) are sometimes present but rudimentary. Front 

 slightly deflexed, of moderate width, and divided into two 

 or four lobes or teeth. The eye-peduncles are short and 

 robust. The antennules are transversely plicated. The 

 basal antennal joint is slender, and occupies the interior 

 hiatus of the orbit; its distal extremity is free, not united 

 to the front. The epistome is short, transverse. The 

 ridges of the endostome are faintly indicated or obsolete. 

 The fourth joint of the external maxillipedes is shorter 

 than the third joint, truncated or slightly rounded distally, 

 and the next joint articulates with it at its antero-internal 

 angle. The first pair of legs, in the male, subequal and 

 moderately robust; third joint trigonous; fourth with a 

 spine or tooth on its interior surface ; palm short, rounded 

 above and below ; fingers distally acute, and denticulated 

 on the inner margins. Walking legs are somewhat 



