GAMMARID^E. 



AMPHIPODA. 



NATATOEIA. 



LYSIANASSIDES. 



LYSIANASSA COSTJS. 



Specific character. Inferior antennae not longer than the superior, the 

 flagellum of each being shorter than their respective peduncles. 

 Length ^ of an inch. 



Lysianassa Costce, EDWARDS, Ann. des Sc. Nat. t. xx. p. 365. pi. x. fig. 17. 



Hist, des Crust, t. iii. p. 21. SPENCE BATE, Report 



Brit. Assoc. 1855, p. 58. Ann. Nat. Hist. (1857) xix. 



138. Cat. Amphipoda, Brit. Mus. p. 69. pi. x. fig. 



11. WHITE, Pop. Hist. Brit. Crust, p. 167. 

 Gammarus glaber, (Spiuola MS.) WHITE, Cat. Brit. Mus. (Crustacea), 1847. 



THE eyes are reniform, of a brown colour, and mode- 

 rately large. The superior antennas are not longer than 

 the head and the first two segments of the body, while 

 the peduncle is scarcely longer than the head, and the 

 flagellum scarcely as long as the peduncle, the former 

 consisting of six or seven articuli, and the secondary 



