A M1MIITH0E GAMMAROIDES. 



AMPHIPODA. 



NAT ATOM A. 



427 



PODOCERIDES. 



AMPH1THOE GAMMAROIDES. 



Specific character. Eyes small, round, and black. Superior antenna? 

 shorter than the inferior. Second pair of gnathopoda larger than the first ; 

 propodos subquadrate. 



Length ^ inch. 



Anvphithoe Gammaroides. Spence Bate, Cat. Ainph. Brit. Mus. p. 235, 



pi. xli. fig. 4. 

 Pleonexes Gammaroides. Spence Bate, Ann. Nat. Hist. 2 ser. vol. xix. 



p. 147. White, Pop. Hist. Brit. Crust. 



p. 199. 



The eyes of this species are very small, round, and 

 black. The superior antennae are more than half the length 

 of the animal. The first joint of the peduncle is longer 

 than the head, the second joint is longer than the first, 

 and the third is not half the length of the second ; the 

 flagellum, which is imperfect in our typical specimen, 

 is about the length of the peduncle. In the inferior 

 antennae the antepenultimate joint of the peduncle ex- 

 tends to half the length of the first joint of the upper ; 

 the penultimate as far as the extremity of the second 

 joint of the upper; while the ultimate is nearly as long 

 as the two preceding ; and the flagellum is about the 

 same length as the last joint of the peduncle, and there- 

 fore reaches beyond the extremity of the superior, 

 unless the flagellum of the latter be preternaturally long. 

 It was on account of the greater length of the inferior 

 to the superior antennae that the original describer first 



