660 Ischyrocerus 



5. I. latipes Kreyer 1842 I. Z., Kreyer in: Naturh. Tidsskr., vA p. 162 1 1893 

 I. l, A. Della Valle in: F. Fl. Neapel, u 20 p.450 t. 57 f. 19 | 1894 I. l, G. 0. Sars, 

 Crust. Norway, v. 1 p. 591 | 1862 Podocerus l, Bäte, Cat. Amphip. Brit. Mus., p. 257 | 

 1876 F.l, A^^Boeck, Skand. Arkt. Amphip., v. 2 p. 600 t. 29 f . 1 | 1887 P. l, H. J. 

 Hansen in: Vid. Meddel., ser. 4 v.9 p. 161 t. 6 f. 3 — 3b. 



Body elongate, depressed, back broad. Head, lateral lobes rounded. 

 Side-plates 3 and 4 much larger than 2"^, 5*'i mucli less deep than the 4*^. 

 Pleou Segment 3, postero-lateral corners quadrate. Eyes obliquely oval, not 

 large. Antenna l more than half as long as body, setose, 1***^ Joint about 

 as long as head, 2*^ much longer, 3*^ as long as 2^; flagellum scarcely 

 longer than 3*^ Joint of peduncle, 9-jointed; accessory flagellum 1-jointed, 

 about half as long as 1^* Joint of primary. Antenna 2 longer, ultimate Joint 

 of peduncle little longer than penultimate, flagellum little longer than 

 ultimate, 7-jointed. Maxillipeds, palp (ßoeck) elongate, the 3*^ Joint (in figure) 

 more than twice as long as broad. Gnathopod 1, 5*^ Joint distally widened 

 and setose, 6*^ oval, nearly triangulär, Vs longer than broad, palm convex; 

 finger long, curved, serrate. Gnathopod 2 in- d much larger, 6*^ Joint very 

 Short, cup-shaped, 6^^ not twice as long as broad, oval, plump; bind and 

 palmar margin evenly convex, fringed with setae; finger long and curved. 

 Gnathopod 2 in 9 (Hansen), 6^^ Joint very short and broad, palm oblique, 

 long, with an emargination, defining angle rounded. Peraeopods 3 — 5, 2^ 

 Joint broad, in peraeoped 3 longer than broad. üropod 3, peduncle very 

 long, rarai very short, the outer (Boeck) having 2 blunt teeth on the end, 

 inner without teeth. Telson longer than broad, oval, apically pointed, with 

 a spine on each side of the apex. L. 14 — 15 mm, 



Arctic Ocean (Greenland). Depth 15 — 188 m. 



6. I. megalops ü. Sars 1894 I. m., G. 0. Sars, Crust. Norway, v. 1 p. 591 t. 210 f. 2. 



6. Body not very slender but somewhat compressed. Head, lateral 

 lobes angular. Side-plates rather large, h^^ much less deep than 4*'*. Pleon 

 Segment 3, postero-lateral corners obtusely quadrate. Eyes unusually large, 

 rounded oval, dark. Antennae 1 and 2 rather strongly built. Antenna 1 

 about half as-long as body; 1^* Joint shorter than head, 2"^ and 3'^ not 

 very long, but each longer than 1^*; flagellum longer than 3*^ Joint of 

 peduncle, 8-jointed; accessory flagellum extremely minute, not nearly half 

 as long as 1^* Joint of primary. Antenna 2 scarcely longer than antenna 1 ; 

 ultimate Joint of peduncle a little longer than penultimate, flagellum sub- 

 equal to penultimate, 6-jointed. Gnathopods 1 and 2 rather stout and similar, 

 but gnathopod 2 much the larger; 6* Joint broad, oval; palm oblique, simple, 

 defined by a slightly marked angle, with several palmar spines. Peraeo- 

 pods 1—5 rather stout; 2<^ Joint in peraeopod 3 very broad proximally. 

 üropod 3 nearly as in I. anguipes (p. 658). Telson tiiangular, with a few 

 simple dorsal setae, apex obtusely pointed. Colour whitish, with indistinct 

 brownish bands. L. 7 mm. 



Arctic Ocean (Hammerfest [Norway]). On hydroids; depth about 75 m. 



7. I. tenuicornis (Ü. Sars) 1879 Podocerus longkornis (err., non Cam. Heller 

 1866!), G. O. Sars in: Arch. Naturv. Kristian., vA p. 461 | 1885 P. tenuicornis, G. 0. 

 Sars in: Norske Nordhavs-Exp., v. 6 Crust. I p. 209 t. 17 f . 3 | 1893 Podoceropsis sophiae 

 (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 452. 



Body rather compressed. Head, lateral corners greatly produced, acute. 

 Side-plates well developed, front lobe of 5*^ notably less deep than 4*^. 



