CEUSTACEANS. 61 



GAMMAEIDJE. 



Atylus (?) AUSTEALis, Miers (?) 



? Paramcera austr alls, Mievs, Annals and Magazine Nat. Hist, iv, vol. xiv, 75, July, 1875. 

 ? Atylus australis, Miers, loo. cit., 117, Aug., 1875. 



There are, in Dr. Kidder's collection, a considerable number of speci- 

 mens of an AtylusWke amphipod which I very hesitatingly refer to this 

 species described by Miers frooi specimens collected at Kerguelen 

 Island by the Eev. A. E. Eaton. Dr. Kidder's specimeus differ in 

 several points fiom the very brief description given by Miers. The 

 most important of these differences is the existence of minute secondary 

 flagella upon the antennulse of our specimens, while Miers's species is 

 said to have "exappendiculate" antennulse. Although the secondary 

 flagellum has usually been said to be wanting in all the Atylinw, it 

 exists, according to Bate, in the young of the typical Atylus carinatus, 

 Leach, and it has very likely been overlooked in the adults of some of 

 the species of the group. Its minute size might have caused it to be 

 overlooked by Miers in the present case. This species cannot be re- 

 ferred to the genus Atylus as restricted by Boeck, but, on account of the 

 doubt in regard to the identity of our specimens with the species de- 

 scribed by Miers, and the doubt whether Paramcera should be retained 

 for Miers's species if a distinct genus, I content myself on the present 

 occasion with the following description of the species in my possession : 



The eyes are very large, oval, and black. The anterior margin of the 

 head projects in a slight obtuse angle, between the bases of the anten- 

 nulte. The antennulse are furnished with a minute secondary flagellum 

 of a single segment, considerably shorter than the diameter of the first 

 segment of the primary flagellum, but tipped with two slender setse sev- 

 eral times as long as the segment itself. 



The gnathopods of the male are subequal, but those of the second 

 pair are somewhat larger than the first. Tbe carpus in each pair is 

 about half as long as the propodus, and the distal portion of the posterior 

 margin is armed with numerous setse. The propodus in the first pair 

 is about a third as broad as long; the edges are nearly parallel, but 

 both slightly convex in outline ; the loosterior margin is furnished with 

 fascicles of short, setilorm hairs ; the palmary margin is furnished with 

 a narrow lamellar edge, is slightly oblique, evenly convex in outline, and 

 the posterior angle is broadly rounded and continuous with the poste- 

 rior margin, which, however, is armed, each side, with several stout 



