Hippomedon 59 



than penultimate. Peraeopods, 7*^^ Joint elongate. Uropod 3, 2^^ Joint of 

 outer ramus rather long. Telson not twice as long as broad, cleft extending 

 '■-7.; of the leugth, dehiscent. L. 11 — 16 mm. 



Arctic üeean. 



2. H. denticulatus (Bäte) 1857 Anonyx d., Bäte in: Ann. nat. Hist., ser. 2 

 /•. ly p. 139 1 1861 A. d., Bäte & Westwood, Brit. sess. Crust., v. 1 p. 101 f. | 1887 Hippo- 

 medov d., H.J.Hansen in: Vid. Meddel., ser. 4 v.9 p. 65 t. 2 f. 2— 2b i 1890 H. d., 

 Gr. 0. Sars, Crust. Norway, v. 1 p. 56 t. 20 | 1893 H. d. (part.), A. Uella Valle in : F. Fl. 

 ^'eapel, v. 20 p. 808 t. 29 f. 33—42 | 1871 H. holb0lli (err., non Anonyx Jiolbölli Kroyer 

 1846!), A. Boeck in: Forh. Selsk. Christian., 1870 p. 102 | 1872 H. h., H. holbölli, 

 A. Boeck, Skand. Arkt. Amphip., v. 1 p. 136 t. 5 f. 6; t. 6 f. 7. 



Head, lateral angles sliglit produced, acute. Side-plate 1 widened 

 below, covering the mouth-organs. Pleon segment 3, postero-lateral angles 

 strongly upturned, unique in having a notch separatiug the acute process 

 from the bind margin, segment 4 without carina. Body smooth, slightly 

 punctate. J]yes linear, slightly widened below, without lenses, light red, 

 transversely striped with opaque white. Antenua 1, joints 1 and 2 bluntly 

 produced, flagellum in o 11-jointed, in ö much longer, accessory flagellum 

 3-jointed. Antenna 2 in Q more than twice as long as antenna 1, in ö as long as the 

 body, ultimate Joint of peduncle nearly twice penultimate. Gnathopod 1, ßt^^oint 

 half as long as b^^, palm finely denticulate. Peraeopods, 7*^' Joint scarcely 

 more than half as long as 6**^. üropod 3, 2*^ Joint of outer ramus very 

 small. Telson nearly twice as long as broad, cleft extending beyond the 

 raiddle, distally dehiscent, with one pair of marginal spinules. Body whitish, 

 pellucid, with some transverse orange bands. L. 9 14, cJ 11 mm. 



Xorth-Atlantic, Xorth-Sea, Skagerrak and Kattegat (Bohuslän, Denmark, Crreat 

 Britain, Trance); Mediterranean. 



3. H. propinqvus O. Sars 1859 Anonyx holbölli (err.. non Kreyer 1846!), 

 R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr. lp.43 | 1890 Hippomedon pro- 

 pinqvus, Gr. 0. Sars, Crust. Norway, v. 1 p. 57 t. 21 f. 1 j 1893 H. propinquus, A. Della 



Valle in: F. Fl. Neapel, r.20 p.810 i 1894 H. squamosus, T. Stebbing in: Bijdr. Dierk., 

 c 17 p.4 t. 1. 



Head, lateral angles narrowly rounded. Side-plate 1 scarcely widened 

 beb)w. Pleon segment 3, postero-lateral angles strongly upturned, acute 

 })rocess without defining notch, segment 4 slightly produced dorsally. 

 Integument very finely and irregularly reticulated. Eyes as in H. denti- 

 culatus. Antenna 1, joints 1 and 2 little produced, 1^* Joint of flagellum very 

 elongate, accessory flagellum slender, 3-jointed. Antenna 2, ultimate Joint of 

 peduncle little longer than penultimate. Gnathopod 1 more slender than 

 in H. denticulatus. Peraeopods 1 and 2, 7^^ Joint nearly as long as 6"\ with 

 cap over the apex. Uropod 3, 2"^ Joint of outer ramus rather large. Telson 

 more than twice as long as broad, cleft extending much beyond the middle, 

 distally dehiscent, with 2 or 3 pairs of marginal spinules. Colour whitish, 

 pellucid, tinged with crimson at either end. L. 9 10 mm. 



Xorth-Atlantic and Arctic Ocean (Trondhjemsfjord, Xordland and Finmark to 

 Yadsö). Depth 37—188 m. 



4. H. robustus 0. Sars 1895 H. r., Gr. O. Sars, Crust. Norw ay, r. 1 p. 679 

 1. 111 f. 1. 



Head, lateral angles acute, scarcely produced. Side-plate 1 a little 

 expanded below, 4*^ much broader than the preceding pairs. Pleon segment 3, 

 postero-lateral angles unusually short and broad, 4*^ segment with dorsal 



