STALK-EYED CRUSTACEA 465 



The abdominal appendages are two - branched, the 

 branches subequal. The telson tapers to a point. The 

 gills spring from the body wall and from the first joint of 

 the external maxillipede. 



Range. — Atlantic, Gulf weed, West Indies, Japan, in 

 deep water; Philippine Islands, near the surface. 



I. Latreutes ensiferus. 



Latreiites ensiferus . . . Stimpson, Spence Bate. 

 Hippolyte ensiferus . . . H. Milne Edwards. 



Body slender. Carapace dorsally rounded, with a 

 small tooth on the gastric region. Rostrum nearly as 

 long as the carapace, slightly curved upwards towards 

 the apex ; extremity serrate, lower margin smooth and 

 curved. Five or six small teeth on antero-lateral angle 

 of carapace. The two last joints of the external maxilli- 

 pedes have spines. The abdomen is smooth. 



Range. — West Indies, Gulf weed, in the open sea near 

 Azores. 



2. Hippolyte. 



Hippolyte . Spence Bate, Leach, H. Milne Edwards, 



Kinahan. 

 I'^crbius . . Stimpson, Heller, Miers, Kingsley, Sars. 



Carapace anteriorly carinated. Rostrum slender, later- 

 ally compressed, the upper margin of which is parallel with 

 the dorsal surface of the carapace, and armed with teeth ; 

 the under margin is excavated at the base, and serrate 

 towards the extremity. There is a supraorbital and an 

 antennal tooth in front. The abdomen is smooth ; the 

 third segment is produced posteriorly in the middle line, 

 and somewhat arcuate. The telson is dorsally flat, 

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