66 Centromedon, Cheirimedon 



nearly as in C. pumilus, but 2^ Joint of outer ramus less elongate. Telson 

 very deeply cleft, much tapering. Colour wMtish. L, 8 mm. 



Arctic Ocean (between Iceland and Jan Mayen, North West of Bear Island). 

 Depth 1240—2260 m. 



2. C. produotus (Goes) 1866 Lysianassa producta, Goes in: Öfv. Ak. Förh., 

 17.22 p. 519 t. 37 f. 4 I 1891 Centromedon affinis, G. 0. Sars, Crust. Norway, v. 1 p. 101 j 

 1893 Ca., Anonyxa., A. Della Valle in: F. FI. Neapel, ij. 20 p. 831, 920. 



Nearly allied to C. pumilus, but differs by its much larger size, by the 

 lateral corners of the cephalon being not straight but slightly upturued at 

 the tip, and by having the postero-lateral angles of pleon segment 3 considerably 

 narrower and more produced (Sars). L. 8 mm (Goes). 



Arctic Ocean and North-Atlantic (Spitzbergen, Norway). 



3. C. pumilus (Lillj.) 1865 Anonyx p., W. Lilljeborg in: N. Acta Soc. Ijpsal., 

 ser. 3 V.6 nr. 1 p. 26 t. 4 f. 35— 41 | 1893 A.p., A. Della Valle in: F. Fl. Neapel, -y. 20 

 p. 831 I 1891 Centromedon p., G. 0. Sars, Crust. Norway, v.l p. 100 t. 34 f. 2. 



Head, lateral angles drawn out into a straight spine-like point. Side- 

 plate 1 narrowed below. Pleon segment 4 with small rounded carina. Eyes 

 wanting. Antenna 1, peduncle not veiy stout, fiagellum with 8 joints, 1^* not 

 elongate, accessory fiagellum 3-jointed. Antenna 2 scarcely longer than 

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

 9-jointed. Gnathopod 1, 6**^ Joint as long as 5*^ tapering distally, palm 

 oblique, ill-defined, 7^^ half length of 6*^ Gnathopod 2, 6*^ Joint oblong oval, 

 more than half length of 5*^, palm transverse. Peraeopods 1 and 2, 6*^' Joint 

 slender, 7*^ long. Uropod 3, inner ramus longer than basal Joint of outer, 

 which has the 2*^ Joint nearly as long as the basal. Telson with 1 or 2 pairs 

 of dorsal spinules. Colour whitish, tinged with red at ends of segments 

 and joints. L. 9 5 mm. 



Arctic Ocean, North-Atlantic (North-America, Norway), Skagerrak (Bohuslän). 

 Depth 94—188 m. 



4. C. typhlops (0. Sars) 1879 An07iyxt., G. 0. Sars in: Arch. Naturv. Kristian., 

 vA p. 436 I 1885 A. t., G. O. Sars in: Norske Nordhavs-Exp., «.6 Crust. I p. 145 t. 12 

 f. 4a — k I 1891 A. t., Centromedon?, G. O. Sars, Crust. Norway, v.l p. 100 | ?1889 A. caecus, 

 Vosseier in: Arch. Naturg., v.65i p. 155 t. 8 f. 8 — 14 | 1893 A. tmgax (part.), A. Della 

 Valle in: F. Fl. Neapel, t;.20 p. 834. 



Head, lateral angles produced, somewhat acutely. Side-plate 1 naiTOwed 

 below. Pleon segment 3, postero-lateral angles shortly but acutely upturned, 

 4**^ with an acutely ending carina. Eyes wanting. Antenna 1, peduncle 

 Short and thlck, fiagellum of 11 joints, 1^* large, accessory fiagellum slender, 

 4-jointed. Antenna 2 rather longer than antenna 1, ultimate and penultimate 

 joints of peduncle subequal, fiagellum 18-jointed. Gnathopod 1, rather stout, 

 6**1 Joint a little longer than 5*^ with oblique but distinct palm. Peraeo- 

 pods 3 — 5, 2*^ Joint oval, üropod 3 as in C. calcaratus (p. 65), telson with 

 cleft not quite so deep. Colour whitish, tinged with red. L. 15' mm. 



Arctic Ocean (between Jan Mayen and Finmark). Depth 3200 ra. 



40. Gen. Cheirimedon Stebb. 



1888 Cheirimedon (Sp. un.: C. crenatipalmatiis), T. Stebbing in: Kap. Voy. 

 Challenger, i'.29 p.638 | 1890 C, G. 0. Sars, Crust. Norway, v.l p.34 I 1893 C, J.Bonnier 

 in: Bull. sei. France Belgique, t). 24 p. 174 | 1893 C, A. Della Valle in: F. Fl. Neapel, 

 j;.20 p.837. 



