50 • Phippsia, Stegocephalus 



-in: Öfv. Ak. Förh., u22 p.521 t.38 f. 9 (not f. 8) | 1893 Aspidopleurus a., A. DellaValle 

 in: F. Fl. Neapel, v. 20 p. 633 t. 59 f. 45 | 1880 Stegocephalus kessleri (nom. nud.), 

 Stuxberg in: Bih. Svenska Ak., v.5 nr. 22 p. 65, 72 ] 1882 S. k., Stuxberg in: Vega-Exp., 

 D. 1 p. 713 f. I 1891 S.k., Aspidopleurus (part.)?. G. O. Sars, Crust. Norway, v.\ p. 204. 



Head with conical acute down-bent rostrura. Side-plate 4 with the 

 gi-eat backward expansion moderately deep. Pleon segment 3 not dorsally 

 produced, postero-lateral corners much curved upward to a subacute point 

 Mouth-organs undescribed. Peraeopod 4, the narrow 2^ Joint with lower hiud 

 Corner ending in a little rounded lobe (Goes). Telsou oval, a little louger 

 than broad, cleft dehiscent, not quite reaching the middle. Colour almost 

 white (J. C. Fabricius). — L. attaining 56-5 mm. 



Arctic Ocean. 



2. P. gibbosa (0. Sars) 1882 Stegocephalus gibbosus, G. 0. Sars in: Forh. Selsk. 

 Christian., nr. 18 p. 85 t. 3 f. 7 | 1891 Asjndopleiirus g., G. 0. Sars, Crust. Norway, v. 1 

 p. 204 t. 71 f. 1 i 1893 A. g., A. Della Valle in : F. Fl. Neapel, v. 20 p. 634 t. 59 f. 46, 47. 



Head without rostrum. Side-plate 4 with lower margin liorizontal, 

 backward expansion very deep, rounded behiud. Pleon segment 3 produced 

 at the end dorsally to a gibbous projection, pointed at the tip, postero- 

 lateral Corners quadrate below, acutely upturned above. Antenna I, 1^* Joint 

 of peduncle scarcely longer than 2^ and 3*^ combined, flagellum with 6 joints, 

 1^* not very elougate, accessory flagellum small. Antenna 2 subequal to 

 antenna 1, ultimate Joint of peduncle ratlier longer than penultimate. Gnatlio- 

 pods 1 and 2, 6**^ Joint narrow. tapering, scarcely longer than 5*'^ Peraeopod 4, 

 2*^ Joint with lower bind angle rounded, not produced, Peraeopod 5, 2*^ Joint 

 oblong, slightly widened distally, rounded end overlapping 3*1 Joint. Telson 

 a little longer than broad, cleft dehiscent, not nearly reaching the middle. 

 •Colour uniformly milk white. L. o 8 mm. 



North-Atlantic(West-Norway). AmongliviugLopheliaprolifera(Pall.). Depth226m. 



2. Gen. Stegocephalus Kr0yer 



1842 Stegocephalus (Sp. uii.: S.inflatus), Kroyer in: Naturh. Tidsskr., vA p. 150 | 

 1891 S., CO. Sars. Crust. Norway, vA p. 197 | 1893 S. (part.), A. Della Valle in: F.Fl. 

 Neapel, v. 20 p. 626. 



Head more or less rostrate. Side-plate 4 deep, completely overlapping 



the 5*^, lower margin evenly curved. Eyes wanting. Antenna 1 with bundles 



of sensory seiae on flagellum, accessory flagellum with 2*^ Joint 



minute. Epistome flattened in front. Upper lip deeply and 



unsymmetrically bilobed. Lower lip, lobes dehiscent with in- 



curved apical tooth. Mandible (Fig. 17), cutting edge coarsely 



dentate, accessory plate of leffc mandible finely serrate. Maxilla 1, 



inner plate fringed with setae all along oblique upper margin, 



outer carrying about a score of spines, palp 1-jointed, tipped 



with a few spines. Maxilla 2, inner plate broad, with nuraerous 



h spines, outer linear, standing apart, tipped with short hooked 



Fig. 17. spines. Maxillipeds, plates apically rounded, outer large, broad, 



M ^dbi^**^^ ht ^^^8'^% serrate on inner margin, not reaching beyond 2^ Joint 



fc left band. ' of palp. Guathopod 1 rathcr stouter than guathopod 2, 6*^ joiut 



narrow in both, tapering only in gnathopod 2. Peraeopods 4 



and 5, 2"^ Joint expanded. üropod 3, rami lanceolate, minutely denticulate. 



Telson triangulär, cleft, unarmed. 



2 species. 



