44 



maiuliliular palp smaller, and the inner liilie of the 2n(l pair of niaxillie 

 narrower. Anterior onatliojioda, as in Lysianassa, simple, not snbclieliform ; 

 posterior ones witli the jjrdpodal joint very slioi't, more or less expanded 

 lielow the daetylus. Pereiopoda less slender, basal joint of the 3 posterior 

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

 gularly arranged, secondary lolies on the one face only. Ijast pair of uropoda 

 with the rami longer than tlie l)asal part, the onter one having a distinct 

 terminal joint. Telson i-atlier large, tapering and deeply cleft. 



llrmarJcti. — Tiie present genus, established In' Boeck, is very 'nearly 

 related to Lysianat<f<u, hotli 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 ceitainly very different from tliat in Ly.sianassa, and 

 for this reason I tliink it will l)e suitable to support the genus, the more 

 so, as there ai'e several foi'ms which pretty well agi'ee with each other in the 

 latter character. Besides the species described belov, the arctic form, Lysi- 

 (mnfisa hiilcnfiridahi >Sp. Bate, unquestionably belongs to the same generic 

 tyi)e, and in all jiroliability also L. Kiiii/iri \\niitp from Van-Dieniens Land. 

 Moreover, some of the s|)ecies of Aixnii/.f descrilieil liy Heller trom the Adriatic 

 Would seem to be more projierly referable to the present genus. 



S. Socarnes Vahli, (Kroyer). 



(PI. 16, %. 2). 



Anon>/.r Yalili, Kroj'er, Qroulands Am]iliipo(ler 1. o., p. 5. 



8yn: Gammarus ngax. Given, not Phipps. 



Body rather slender but somewhat thickisli, witli liroadly rounded liack. 

 Cephalon I'ather deep, with the lateral corners l)ut slightly produced and 

 narrowl\- 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 antenuEe with the 1st joint of the peduncle 

 about twice the length of the other 2 comljined, ilagellum about as long aa 

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

 the length of the flagellum, 7-articulate. Liferior 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 

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



