GAMMARID;E. 



A MPH1P ODA . P H OXIDES. 



NATATORIA. 



Genus DARWINIA. 



Darwinia. SPENCE BATE, Brit. Assoc. Rep. 1855, p. 58. Ann. Nat. Hist. 

 1 per. xix. 141, Feb. 1857. Cat. Crust. Amph. Brit. Mus. 

 p. 108. 



Generic character. Cephalon produced anteriorly. Superior 

 antennae without a secondary appendage. Gnathopoda smaller 

 than the pereiopoda, subchelate. Pereiopoda subequal ; dactyla 

 powerful. Posterior pair of pleopoda biramous. Telson 

 le. 



THE head of this genus is produced anteriorly to a 

 point. The body is arched, and the segments subequal. 

 The third segment of the tail is remarkable for being not 

 so deep as the preceding, a feature which exhibits an 

 approximation to the character of Oxycephalus, and other 

 genera among the Hyperina. The eyes are round, and 

 situated at the lateral margins of the head, between the 

 superior and inferior antennae. The superior antennae 

 are subequal to the inferior, somewhat more robust, and 

 not furnished with a secondary appendage. The first 

 two pairs of legs are small, and imperfectly subchelate, 

 the second being a little larger than the first, but neither 

 of them is as large as the true walking legs, all of which 

 are about the same length, rather short, but very robust 

 and strong, each terminating in a long, stout, slightly- 

 curved, sharp finger. The caudal appendages are bi- 

 ramous, and the terminal piece consists of a single 

 plate. 



This genus bears a close resemblance to Kroyer's de- 



