Siphonoecetes 683 



about thrice as broad as deep, outdrawn behind into a veiy long poiut. 

 Eyes not visible. Antenna 1 about half as long as body; joints of peduncle 

 successively a little shorter, together more than thrice as long as flagellum, which 

 is 4 — 6-jointed. Antenna 2 nearly as long as body, nearly twice as long as 

 antenna 1, ultimate Joint of peduncle shorter than penultimate, a little 

 longer than antepenultimate ; flagellum shorter than ultimate Joint of peduncle, 

 with 1 long and 2 very short joints, last broader than long, tipped with 2 diver- 

 gent spiues. Antennae 1 and 2 very setose. Gnathopod 1, 5*^ Joint a 

 little longer and distally much broader than the conical 6*^, which has strong 

 spines on bind margin; finger about half as long as ü^^ Joint, with 7 or 8 

 serrations on inner margin, and with a tubercle near the apex. Gnathopod 2 

 slightly shorter but far stouter than gnathopod 1, 2^ Joint % as broad as 

 long, 4*'^ produced with blunt apex, 5*^ cup-shaped, its narrow lobe tipped 

 with a strong spine looking like a continuation of the lobe, 6*^ oval, bind 

 margin much more convex than front, with 7 large spines on it successively 

 larger to the palm, which is shorter and has 2 sharp tubercles; flnger curved, 

 acute, with about 10 teeth, and near the apex a tubercle and 2 long setae. 

 Peraeopods 1 and 2 not diflfering from those of S. colletti. Uropod 3, peduncle 

 broadly produced on inner side, ramus scarcely produced beyond it, oval or 

 somewhat conical, with 12 strong setae. Telson much broader than long, 

 bare. Colour pale yellow, marbled with brown, L. 6 mm. 



Arctic ücean (Greenland). Depth 30 — 35 ni. 



2. S. pallidus 0. Sars 1882 S. p., G. 0. Sars in: Forh. Selsk. Christian., nr. 18 

 p. 113 t. 6 f. 7a-d, 7x | 1894 S. j)., G. 0. Sars, Crust. Norway, v.l p. 611 t. 218 f. 2 | 

 1893 S. typicus (part.), A. Della Valle in: F. Fl. Neapel, «;. 20 p. 358. 



Head, rostrum small; lateral corners extremely narrow, not widened 

 apically. Eyes replaced on each side by a small patch of an opaque whitish 

 pigment. Antenna 1 not reaching end of penultimate Joint of peduncle of 

 antenna 2; joints of peduncle successively shorter; flagellum about half as 

 long as peduncle, with 7 joints. last minute. Antenna 2 nearly as long as 

 body, ultimate Joint of peduncle shorter than penultimate. Gnathopod 1, 

 6*'^ Joint much narrower than 5*^^ and scarcely tapering distally. Gnathopod 2, 

 €^^1 Joint armed with 5 spines on bind margin. üropod 3, inner expansion 

 of peduncle comparatively narrow, ramus very small, not reaching beyond 

 Expansion of peduncle. Colour pale yellowish. L. about 4 mm. 



Arctic Ocean and North-Atlantic (West-Norway up to Hasvig [Finmark]). Depth 

 1)4 — 282 m. Usually in shells of Dentalium. 



3. S. colletti Boeck 1862 S. typicus (err., non Kroyer 1845!), Bäte & Westwood, 

 Brit. sess. Crust., v. l p. 465 f. | 1893 S. t. (part.), A. Della Valle in: F. Fl. Neapel, n 20 

 p. 358 i 1871 S. colletti, A. Boeck in: Forh. Selsk. Christian., 1870 p. 258 1 1876 S. c, 

 A. Boeck, Skand. Arkt. Amphip., v.2 p. 633 t. 28 f. 9 | 1894 S. c. {S. mucronatm Aug. 

 Metzger in MS), G. O. Sars, Crust. Norway, v.l p. 610 t.218 f . 1 . | 1871 S. cuspidatiis, 

 Aug. Metzger in: Jahresber. Ges. Hannover, v.21 p. 30 | 1873 S. c. (sp. nov. !), (S. I. 

 Smith in:) A. E. Verrill in: Rep. IJ. S. Fish Comm., v. 1 p. 501, 566. 



Head, rostrum acute (Sars: short, tiiangnlar; Smith: long, slender); 

 lateral lobes much produced, apically swollen, carrying the well developed, 

 rounded, dark eyes. Antenna 1 considerably exceeding half length of body, 

 reaching beyond penultimate Joint of peduncle of antenna 2 (Sars), about to 

 middle of that Joint (Smith); 3 joints of peduncle subequal; flagellum decidedly 

 (Sars)*or scarcely (Smith) longer than a Joint of peduncle, 5— 7-jointed. 



