STALK-EYED CRUSTACEA 347 



external appendage (exognath) absent. Antennee with 

 the accessory joint minute or obsolete. 



Synopsis of the Genera. 



A. Internal antennae of moderate length. 



a. Antenna very short. 



a^. Last joint of external maxillipedes unguiculate. — 

 {Remipes.) 



b. Antennae very long. 



b^. Last joint of external maxillipedes laminate and 

 compressed. — {Hippa?) 



I. Remipes. 



Rcniipts Latreille, H. Milne Edwards, 



Stimpson, Miers, Henderson, 

 Latreille, Lamarck. 



SqiiUla Petiver. 



Cancer Herbst 



Hippa Fabricius. 



Carapace ovate, the fronto - orbital border sinuous. 

 Ocular peduncles slender. Antennular peduncle moder- 

 ately stout, one of the flagella strongly developed. 

 Second joint of the antennal peduncle of large size, 

 with a slight external prolongation ; the flagellum 

 short. 



External maxillipedes with the fourth joint dilated, 

 the third rudimentary, and the last joint unguiculate. 

 Last thoracic segment free. Terminal segment exceeding 

 the remainder of the abdomen in length. Female with 

 three pairs of abdominal appendages in addition to the 

 penultimate pair. 



Range. — West Indies, Florida, West Coast of Africa, 

 Cape Verde Islands, Ascension Island, Pacific. 



