Iscliyrocerus 659 



3. I. megacheir (Boeck) 1871 Podocerusm., A.Boeck in: Forh. Selsk. ("hristian., 

 1870 p. 247 i 1876 F. m., A. Eoeck, Skand. Arkt. Ampliip., v. 2 p. 602 t. 29 f. 4 \ 1893 

 Podoceropsis ni. (part.), A.DellaValle in: F. Fl. Neapel, ».20 p. 453 | 1894 Ischyrocerus m., 

 G. O. Sars, Crust. Norway, v. 1 p. 592 t. 211 | ?1895 I. tu., A. M. Norman in: Ann. nat. 

 Hist., ser. 6 v. 15 p. 492. 



Body rather long and siender. Head, lateral lobes acute. Side-plates 

 not very deep, P* quadrate in front, 4^^ scarcely larger than 3<^, 5*^ nearly 

 as deep as 4*^. Pleon segment 3, postero-lateral corners quadrate. Eyes 

 rather large, rounded oval, light brown. Antennae 1 and 2 about -/^ as 

 long as body, with long setae, antenna 2 rather the longer. Antenna 1, 

 1^* Joint shorter than head, 3*^ elongate, as long as 2^ or a little longer; 

 flagellum longer than ^^ Joint of peduncle, with 9 — 10 joints in ä and 

 4 — 8 in 9 ; accessoiy flagellum as long as 1^* Joint of primary, with 

 minute 2*^ Joint. Antenna 2, ultimate Joint of peduncle longer than 

 penultimate, shorter than flagellum, which has 8 — 11 joints. Gnathopod 1, 

 e*'^ Joint oval, with palm ill-defined, larger in ä than in 9 . Gnathopod 2 

 in cf , 6*^ Joint large and tumid, about thrice (or less) as long as broad; 

 palm slightly flexuous and a little crenulate, defined by an obtuse angle 

 with small palmar spines; finger strong, apex impinging within border of 

 palm. Gnathopod 2 in 9 similar to gnathopod 1, but with shorter 5*^ and 

 more oblong and stouter 6*^ Joint. Peraeopods 1 — 5 siender; 2^ Joint in 

 peraeopods 3 — 5 oblong oval, narrowing downward. Uropod 3, peduncle 

 elongate, outer raraus but slightly hooked at the tip, with 1 denticle on 

 Upper edge. Telson as long as broad, with 2 setae on each side of sub- 

 acute apex. Colour whitish, pellucid, with light transverse orange bands 

 L. 7—12 mm. 



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

 Depth 100—1444 ra. 



4. I. assimilis (0. Sars) 1879 Podocerus a., Gr. 0. Sars in : Arch. Naturv. Xristian., 

 v.i. p. 450 I 1885 P. a., G. 0. Sars in: Norskc Nordhavs-Exp., u 6 Oust. I p. 205 t. 17 

 f. la — c I 1893 Podoceropsis megacheir (part.), A.DellaValle in: F. Fl. Neapel, t?. 20 p.453. 



Body rather elongate. Head, lateral lobes acutely produced. Side- 

 plates of moderate depth, 1^* rounded in front, h^^ notably not so deep 

 as 4*h. Pleon segment 3, postero-lateral corners obtusely rounded. Eyes 

 rather small, longitudinally oval, dark brown. Antennae 1 and 2 powerful, 

 subequal, more than half as long as body. Antenna 1, 1^* Joint as long as 

 head, 2<^ and 3*^ much longer, equal; flagellum longer than 3^ Joint of 

 peduncle, 9-jointed; accessory flagellum 1-jointed, veiy small, scarcely more 

 than ^/^ as long as 1^* Joint of primary. Antenna 2, ultimate Joint of peduncle 

 rather longer than penultimate, both elongate, flagellum as long as ultimate, 

 8-jointed. Gnathopod 1, 6*^ Joint oval, palm quite undeflned, unless by extent of 

 finger. Gnathopod 2, especially in d, powerful, 6*^ Joint very large and 

 tumid, as long as 4 preceding joints together, oblong oval; the long nearly 

 straight bind or palmar raargin fringed with partly plumose setae; finger 

 strong, falciform, closing upon inner surface of band. Peraeopods 3 — 5, 

 2^ Joint oblong; peraeopod 4 much louger than 3*^, 5*^^ than 4*^. Uropod 3, 

 peduncle rather elongate, rami remarkably small. Telson short, but thick, 

 tubulär. Colour whitish, with brown spots or shadings. L. reaching 8 mm. 



North-Atlantic and Arctic Ocean (west of Helgeland, depth 850 m; south of 

 Bear Island, deptli 66 m). 



42* 



