464 STALK-EYED CRUSTACEA 



Family III. Hippolytidae. 



Hippolytidce . . . Spence Bate. 



Rostrum large. The first and second pairs of legs 

 armed with pincers ; the first pair moderately robust. 

 The posterior three pairs of legs are simple. 



Synopsis of the Genera. 



I. First and second pair of legs with pincers. 



A. Rostrum compressed, deep. — {Latreutcs.) 



B. Rostrum slender, toothed. — {Hippolyte.) 



I. Latreutes. 



Latrcutes . . Stimpson, Spence Bate. 



Rostrum elongate, being more than half the length of 

 the carapace, laterally compressed and deep. Internal 

 antennae subequal in length to the rostrum. The 

 external antenuct have an acutely pointed basal scale. 

 The mandible has only a molar process, no palp. The 

 first maxillipede is seven -jointed, has a branchial plate 

 and an external appendage. The external maxillipedes, 

 five -jointed, robust and rigid, have a small gill plume 

 from the first joint and a short external appendage. 



The first pair of legs is short, robust, and terminates in 

 a strong pincer ; the sixth joint articulates at the inferior 

 angle of the fifth joint, the upper portion falling into an 

 excavation in the distal margin of the fifth joint. The 

 fifth articulates at the inferior extremity of the fourth 

 joint, which is excavated in such a way as to receive the 

 fifth joint when extended. The second pair of legs is 

 slender, and has pincers. The three last pairs of legs are 

 slender, and terminate in simple joints. 



