Stegoplax, Peltocoxa 159* 



Body Short and stout. Head boldly rostrate. Side-plates 1 and 2 rudimentary, 

 3'^ and 4*^ very large, confronted margins closely fitting, ö^^ and 7*^^ not con- 

 cealed (Fig. 40). Eyes feebly developed. 

 Antennae 1 and 2 and mouth-parts as in Cy- 

 proidea (p. 157), except that the mandible has a 

 well developed molar, and the maxillipeds have 

 the apex of inner plates transverse, not oblique, 

 and outer reaching end of 1^* Joint of 

 palp. Gnathopods 1 and 2 subequal, similar, 

 scarcely subchelate, slender, 5*^ Joint a 

 little produced. Peraeopods 1 — 5 slender, 

 but 2*^ Joint expanded in 4*^^ and 5*^ 

 pairs. Uropod 3 larger than uropod 2, Fig. 4o. s. longirostris, $ . 



and reaching much beyond it. Telson entire. [Afte/ö. a^Sars.] 



1 species. 



1. S. longirostris 0. Sars 1882 S.Z., G. O. Sars in: Forh. Selsk. Christian.^ 

 nr. 18 p. 88 t. 3 f. 11 | 1892 S. l, G. O. Sars, Crust. Norway, v. 1 p. 232 t. 79 f . 2 | 1893 

 Peltocoxa l, k. Della Valle in: F. Fl. Neapel, v. 20 p. 650 t. 59 f. H4, 65. 



Head, rostrum very long, slightly curved, acuminate. Side-plates 1 and 2 

 concealed, 3 aud 4 with the margins in a uniform curve to the emargination of 

 the 4**1, which almost completely receives the 5*^; 5*^ deeper behind than 

 in front. Pleou segment 3, postero-lateral angles rather produced backward, 

 not acutely; segment 6 with 2 longitudinal ridges apically acute (Fig. 40) 

 Eyes small, rouuded, 3 components, pigment red with whitish coating. Antenna 1, 

 1^* Joint as long as 2<^ and 3<^ combined, flagellum with 5 joints, P* much the largest, 

 all with long band-like seusory filaments. Antenna 2, ultimate Joint of peduncle 

 twice length ofpen ultimate, flagellum with 4 joints, P* much the longest. Gnatho- 

 pods 1 and 2 similar, &^^ Joint narrow, scarcely longer than 4**^ and 5*^ combined, 

 palm not distinctly defined, minutely ciliated, with 2 spinules in gnathopod 1, and 

 one in the narrower gnathopod 2, h^^ Joint produced behind to a setiferous lobe, 

 finger slender, finely spiuulose on inner margin. Peraeopods 1 and 2 very slender,. 

 longer than the others. Peraeopods 4 and 5, 2^ Joint with sinuosity in bind 

 margin of expansion. uropod 3 much longer than uropod 2, peduncle longer 

 than the slender unarmed rami. Telson conically triangulär and flattened, 

 reaching end of peduncle of uropod 3. Colour greyish white. L. 9 about 2 mm.. 



Hardangerfjord, Trondhjemsfjord, Arctic Ocean (Lofoten Isles). Depth282 — 565 m. 



8. Gen. Peltocoxa Catta 



1875 Peltocoxa (Sp. un.: P. marioni), Catta in: Rev. Sei. nat., r. 4 p. 161 | 1893 

 P. (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 647. 



Body Short and stout. Head with very small rösti'um. Side-plates and 

 peraeopods 1 — 5 nearly as in Stegoplax. Eyes well developed. Antennae 1 and 2 

 small. Antenna 1 much the stouter, with small, 1-jointed accessory flagellum,^ 

 the priucipal flagellum having a stout P* Joint fringed with very long sensory 

 filaments. Mouth-parts apparently in close agreement with those of Stegoplax, 

 except that both plates of maxilla 2 are slender, and the outer plates of 

 maxillipeds reach beyond 1^* Joint of palp. Gnathopod 1 scarcely subchelate, 

 5*^ Joint a little produced. Gnathopod 2 strongly subchelate, 5*^ Joint very 

 little produced. Uropod 1 longer than uropod 2, uropod 2 longer than 

 uropod 3 and reaching beyond it. Telson entire, large, boat-shaped. 



1 species accepted, 1 doubtful. 



