^6 Onisimus 



Anteniia 1 iu Q , flagelluiu with 1 öjoints, 1^*^ equal to 2'^ and S^ corabined, accessoiy 

 flagellum 6-jointed. Antenna 2 a little longer tban antenna 1, flagellum 

 18-jointed. Gnathopod 1, 6^^ Joint much longer tlian 5*'', distally a little 

 curved, palm not very oblique, somewbat arcuate, finely denticulate. Gnatho- 

 pod 2 very slender, 6*'^ Joint raore tban twice as long as broad, more tban 

 half as long as 5**1, scarcely dilated distally, palm and finger minute. 

 Peraeopods 3 — 5, 4^^ Joint moderately robust, 2*^ of 5*^ pair large, as long 

 as rest of lirab. Uropod 3 with 2 spinules on inner margin of inner ramus. 

 Telson rounded, scarcely longer than broad, incisiou very sbort, apices broad. 

 Colour pale reddish yellow. eggs in pouch brigbt orange. L. 11 — 14 mm. 



Arctic Ocean; North- Atlantic and North-Sea (VVest-Norway). Depdi 15 — 94 m. 



2 O. plautus (Kreyer) 1845 Anonyx p., Kroyer in: Naturh. Tidsskr., ser. 2 

 v.\ p.629 I 1846 A.p., Kreyer in: Naturh. Tidsskr., ser. 2 r. 2 p. 39 i 184H A. p. (part.), 

 Kreyer in: Voy. Nord. Crust. t. 15 f . 2 j 1898 A.p. (part.), A. Della Valle in: F. Fl. 

 Neapel, «.20 p. 828 \ 1866 Lysianassa plauta, Goes in: Ofv. Ak. Förh., v. 22 p. 521 | 

 1871 Onisimus plautus, A. Boeck in: Forh. Selsk. Christian., 1870 p. 112] 1894 0. p., 

 T. Stebbing in: Bijdr. Dierk., i).17 p. 10 | 1872 & 76 Onesimus p., A. Boeck, Skand. Arkt. 

 Amphip., V. 1 t. 4 f. 2 ; I). 2 p. 164 I 1891 0. p., G. 0. Sars, Crust. Norway, v. 1 p. 107 t. 37 f. 1. 



Head, lateral angles acute. Side-plate 1 narrow, scarcely expanded 

 feelow, 4*^ with hinder expansion obtuse, very slight. Pleon segment 3, 

 postero-lateral angles with upturned point. Eyes mucb wider below than 

 above, larger in ö than in Q, red. Antenna 1 in 9, flagellum with 11 joints, 

 1^* equal to next 3 combined, accessory flagellum 4-jointed. Antenna 2 a little 

 longer than antenna 1, flagellum 13-jointed. Both antennae in d considerably 

 longer than in 9, flagella slender, with more joints. Gnathopod 1, 6*'^ Joint 

 subequal to 5**^, palm nearly transverse but with corner rounded off, Gnathopod 2, 

 6*^ Joint more than half as long as 5*'\ a little dilated distally. Peraeopods 

 3 — 5, 4*^ Joint very robust, 2'^ of peraeopod 5 much longer than rest of 

 limb. üropod 3 with no spinules on either ramus. Telson. rounded oval, 

 incised for ^.^ of length, apices rather narrow, indented. Colour reddish 

 jellow to light brown. L. 8 mm. 



Arctic ücean; North-Atlantic and North-Sea(West-Norway); Skagerrak (Bohusiän). 



3. O. normani (0. Sar.s) 1891 & 95 Ovesimus n., (Schneider in MS.) G. 0. Sars, 

 ■Crust. Norway, v. 1 p. 106 t. 36 f. 2; p. 686 | 1893 Amnyx n., A. Della Valle in: F. Fl. 

 Neapel, «.20 p. 827. 



Head, lateral angles acute. Side-plate 1 scarcely expanded below, 

 4*^ with binder expansion short and blunt. Pleon segment 1, antero-lateral 

 angles sliarply uncinate, segment 3 with postero-lateral angles acutely uncinate. 

 Eyes oblong oval, red. Antennae 1 and 2 in 9 sbort and stout; antenna 1, 

 flagellum with 8 joints, the 1^* large, accessory flagellum 3-jointed. Antenna 2, 

 flagellum 8-jointed. Gnathopod 1, 6*^ Joint scarcely or not longer than 5*^, 

 palm not curved, very oblique and spinulose, angle indistinct. Gnathopod 2, 

 6**1 Joint half length of 5*^ scarcely widening distally. Peraeopods 3 — 5, 

 4*'^ Joint not robust, 2^ of peraeopod 5 as long as rest of limb. üropod 2, inner 

 ramus constricted. üropod 3, rami witbout spinules, Telson a little longer 

 than broad, incised for rather more than V3 of the length, apices moderately 

 broad, indented, Colour pure white, eggs in pouch reddish, L. 9 mm. 



Arctic Ocean (Tromsö, Finmark), Christianiafjord. 



4. O. turgidus (O. Sars) 1879 Anonyx (0.) f., G. O. Sars in : Arch. Naturv. Kristian., 

 <J.4 p.437 I 1885 0. t., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. 1 p. 147 t. 12 

 f. 5, 5a -i I 1893 Anonyx plautus (part.), A. Della Yalle in: F. Fl. Neapel, p. 20 p. 828. 



