Socarnoides 47 



27. Gen. Socarnoides Stebb. 



1888 Socarnoides (Sp. un.: S. kergueleni), T. Stebbiag in: Rep. Voy. Challenger, 

 JJ.29 p. 690 I 1893 S., A. Della Valle in: F. Fl. Neapel, ?;.20 p. 793 | 1890 Socarnioides 

 (laps.), Beddard in: Zool. Rec, v.25 Index p. 15. 



Body compact, side-plates rather large. Antenna 1, peduucle stout, 

 2*^ and 3*^ joints not extremely short, flagellum of few joints. Antenna 2 

 geniculate, ultimate Joint of peduncle shorter than penultimate. Epistome 

 projecting rather beyond upper lip, separated by deep incision. Lower 

 lip with narrowed lobes and mandibular processes divergent. Mandible 

 narrowly elongate, cutting edge simple, molar weak, palp of moderate length, 

 attached far back. Maxiila 1, inner plate witliout setae, outer carrying 

 11 spines, palp with P* Joint very short, 2*^ large, somewhat tapering, 

 without spines or teeth, but slightly serrate. Maxillipeds, inner and outer 

 plates long, scantily armed, the outer extending far along 3*^ Joint of palp. 

 Gnathopod 1 not subchelate, 7^^ Joint small. Gnathopod 2 minutely chelate. 

 Peraeopods 3 — 5, 2*^ Joint greatly expanded, especially in peraeopod 5. 

 üropod 2, shorter than uropod 1, rami subequal, inner with spiniferous 

 constriction. üropod 3, shorter than uropod 2, peduncle produced into 

 a dentiform process, rami not long, outer the longer, with small 2^ Joint. 

 Telson small, narrowing distally, cleft not reaching the centre, dehisceut. 



2 species. 



Synopsis of species: 



Maxillipeds, outer plates obtusely pointed 1. S. kergueleni . p. 47 



Maxillipeds, outer plates apically rounded 2. S. stebbingi . . p. 47 



1. S. kergueleni Stebb. 1888 S. k., T. Stebbing in: Rep. Voy. Challenger, 

 V. 29 p. 691 t. 25. 



Head, lateral angles rounded, projecting. Side-plate 1 not distally 

 produced forward. Pleon segment 3, postero-lateral angles rounded. Eyes 

 lai'ge, reniforra. Antenna 1, flagellum with 8 joints, 1^* not very large, accessory 

 flagellum 4-jointed, Antenna 2, geniculate between penultimate and ante- 

 penultimate Joint of peduncle, ultimate of peduncle shorter than penultimate, 

 flagellum 7-jointed. Maxillipeds, outer plates large, with apex obtusely pointed, 

 1 seta on inner margin. Gnathopod 1, 6*^ Joint tapering, narrower and 

 slightly longer than 5*^, 7**^ Joint small. Gnathopod 2, 6*^^ Joint slender, 

 much shorter than 5*^, the thumb shorter than the small finger, thus making 

 a rather imperfect chela. Peraeopods 1 — 5, 4*^ Joint rather broad. Peraeo- 

 pod 3, 2*^ Joint almost round, scarcely as large as the side-plate. Peraeo- 

 pod 5, 2*^ Joint very large, as long as rest of limb. Uropod 3, inner ramus 

 not much shorter than outer. L. about 7 mm, 



Southern Indian Ocean (Kerguelen Island). Depth 54 — 230 m. 



2. S. stebbingi (G. M. Thoms.) 1893 Lysianax s., G. M. Thomson in: P. R. 

 Soc. Tasmania, 1892 p. 19 t. 3 f. 9—18; t. 5 f. 9, 10. 



ö . Closely agreeing with S. kergueleni in most respects, though in a few 

 rather strikiugly different. Side-plate 1 large, in figure very large, distally 

 produced forward. Antenna 1, flagellum about 10-jointed, accessory flagellum 

 about 6-jointed. Antenna 2, geniculate between ultimate and penultimate joints 



