GAMMARID^E. 



AMPIIIPODA. 



NATATORIA. 



LYSIANASSIDES. 



LYSIANASSA ATLANTICA. 



Specific character. Inferior antennae as long again as the superior. 

 Length | g of an inch. 



Gammarus Atlanticus. 

 Lysianassa Atlantica. 



MILNE-EDWARDS, Ann. des Sc. Nat. t. xx. 

 MILNE-EDWARDS, Hist, des Crust, t. iii. p. 22. 

 SPENCE BATE, Cat. Amph. Brit. Mus. p. 68, 

 pi. x. fig. 10. 

 Lysianassa marina. SPENCE BATE, Ann. Nat. Hist.v. xix. p. 138 (1857). 



WHITE, Pop. Hist. Brit. Crust, p. 168. 



Opis lypica. WHITE, Pop. Hist. Brit. Crust, p. 168. Cat. Crust. 



Brit. Mus. 1850, p. 49 (but not of Kroyer, Nat. 

 Tidsk. iv. 149, Voy. Scandin. tab. 17, fig. 1.) 



THE superior pair of antennae are not longer than the 

 head and first two segments. They have the first joint 

 of the peduncle very large ; the upper margin is con- 

 tinuous with the upper line of the head, and suddenly 

 curved down towards the distal extremity a circumstance 



