44 



mandibular palp smaller, and the inner lobe of the 2nd pair of maxillae 

 narrower. Anterior gnathopoda, as in Lysianassa, simple, not snbcheliform ; 

 jtosterior ones with the propodal joint very short, more or less expanded 

 below the dactylns. Pereiopoda less slender, basal joint of the 3 posterior 

 pairs greatly dilated. Branchial lamellae with distinct, though somewhat irre- 

 gularly arranged, secondary lobes on the one face only. Last pair of uropoda 

 with the rami longer than the basal part, the outer one having a distinct 

 terminal joint. Telson rather large, tapering and deeply cleft, 



lidiHirkx. The present genus, established by Boeck, is very nearly 

 related to Lysi<i*xa, both as to the oral parts and the other limbs. The 

 only character which more markedly distinguishes it, is the structure of 

 the telson, which is certainly very different from that in Lysianassa, and 

 for this reason I think it will be suitable to support the genus, the more 

 so, as there are several forms which pretty well agree with each other in the 

 latter character. Besides the species described below, the arctic form, Lyxi- 

 <i))ttxx<t bidenticulata Sp. Bate, unquestionably belongs to the same generic 

 type, and in all probability also L. Kroycri White from Van-IHemens Land. 

 Moreover, some of the species of Anonyx described by Heller from the Adriatic 

 would seem to be more properly referable to the present gHius. 



8. Socarnes Vahli, (Kroyer). 



(PI. 16, fig. 2). 



Anonyx Vahli, Kroyer, Gronlands Amphipoder 1. c., p. 5. 

 Syn: Gammarus ngax, Given, not Phipps. 



Body rather slender but somewhat thickish, with broadly rounded back. 

 Cephalon rather deep, with the lateral corners but slightly produced and 

 narrowly rounded. Coxal plates rather large but scarcely more than twice 

 the depth of the body and comparatively narrower than in Lysianassa; 5th 

 pair nearly as deep as broad. Last pair of epimeral plates of metasome 

 broadly rounded or almost obtusely truncated at the posterior corners. Eyes 

 reniform, pigment black. Superior antennae with the 1st joint of the peduncle 

 about twice the length of the other 2 combined, tiagellum about as long as 

 the peduncle, 12-articulate, 1st joint rather small, accessory appendage half 

 the length of the flagellum, 7-articulate. Inferior antennae in female scarcely 

 longer than the superior, in male greatly elongated, exceeding in adult speci- 

 mens the length of the body. Epistome and anterior lip almost exactly as 

 in Lysianassa. Anterior gnathopoda with the basal joint shorter than the 

 remainder part of the leg, propodos about the length of the carpus, evenly 



