60 NATURAL HISTOEY OF KERGUELEN ISLAND. 



postero- inferior angles strongly produced. Infero-posterior angles of 

 the second and third segments of the pleon obtusely rounded and not 

 produced. Uropods all short ; the posterior pair especially so ; the base 

 as thick as long; the outer ramus slender and shorter than the base; 

 the inner minute, not more than half as long as the outer. Telson as 

 broad as long, narrowed toward the extremity, which is truncated and 

 slightly excavated. 



Length, excluding antenure, 3'°™. to 4°^™. 



Eocky beaches, with the last species. 



All the specimens received are apparently immature, and the males 

 evidently, and very likely the females also, have not attained the adult 

 characters. The species does not agree fully with the characters 

 assigned by Boeck to the genus Lysianassa as restricted by him, and I 

 therefore subjoin a description of the appendages of the mouth. 



The mandibles are slender, with the molar area half-way from the 

 tip to the attachment of the long and slender palpus which arises near 

 the base. The inner lobe of the first maxilla is large, reaches more than 

 two-thirds of the way to the tip of the outer lobe, and is furnished with 

 two very minute setae at the tip and numerous fine hairs along the 

 inner margin ; the palpus is very slender and tapers to a point, near 

 which it is armed with a very few slender spines. The inner lobe of the 

 second maxilla is broad and nearly or quite as long as the outer lobe. 

 The inner lobe of the maxillipeds is elongated, armed at the tip with 

 three obtuse teeth, and reaches to the distal extremity of the second 

 segment of the palpus; the outer lobe is very large, unarmed, and 

 reaches beyond the middle of the third segment of the palpus; the 

 palpus is slender, the ultimate segment styliform and less than half as 

 long as the penultimate. 



The autennulse, mandibles, second maxillsB, maxillipeds, and posterior 

 uropods are more like some of the species of Orchomene than they are 

 like the species of Lysianassa, as described and figured by Boeck, and 

 the characters assigned to Lysianassa by this author would require con- 

 siderable modification to admit our species. 



Lysianassa Jcerguelenij Miers (Annals and Magazine Nat. Hist., iv, 

 vol. xvi, p. 74, 1875), collected at Kerguelen by the Eev. A. E. Eaton, 

 Judging from the very short description, is quite a different species and 

 not a Lysianassa^ even in the unrestricted sense in which that generic 

 term is used by Kroyer and Bate, for the first pair of gnathopods are 

 said to be " subchelate." 



