178 Metopa 



Gnathopod 2 (see Lilljeborg's tigure) very large, especially in ö (Fig. 46), 4*^ and 

 5*^ joints cup-shaped as in M. alderii (p. 175), 6*^^ long, gradually widening distally, 

 palm angularly produced in the middle, niiuutely erenulate thence to the hinge, 

 this part separated by a deep narrow incision froni a deiining tooth which extends 

 beyond the rest of the Joint and beyond the tinger when closed. Peraeopod 1 

 more slender tban peraeopod 2, but with the 2^ Joint rather broad and laminar. 

 Peraeopods 2 — 5, finger strong, miuutely serrulate within, 4*^ Joint produced, 

 especially in peraeopod 5, 2*^ Joint oval, not veiy long, in peraeopods 4 and 5. 

 Uropod 3, peduncle with 1 spine on nodiform projection of apex, 1^* Joint 

 of ramus longer than 2'^. nearly as long as peduncle. Telson triangulär 

 oval, tapering to a narrow apex, 2 pairs of lateral spinules. Colour whitish- 

 yellowish, with naiTOW orange band to each segment; ova bright bluish. L. 9 

 8 mm, (5 rather larger. 



Arctic Ocean, North-Atlantic and Xorth-Sea (Norvvav, deptli 55^94 m; Greenland; 

 Murman coast; British Isles). 



12. M. boeekii 0. Sars 1868 Montagna norvegica (err., non Leucothoe n. 

 Liljeborg 1850!), Bäte & Westwood, Brit. sess. Cnist., v.2 p. 500f. | \%11 Metopa hruzdii 

 (err., non Moniaguab. Qocs 186fi!), A. Boeck in: Forh. Selsk. Christian., 1870 p. 142 | 

 1876 M.b., A. Boeck. Skand. Arkt. Aniphip., v.2 p. 458 t. 18 f. 2? | 1882 M. borealis 

 (pari), G. 0. Sars in: Forh. Selsk. (Äristian., nr. 18 p. 91 t. 4 f. 4a [ 1892 M. boeekii, 

 G. 0. Sars, Crnst. Norway, v. 1 p. 252 t. 88. 



Body slender and compressed. Head, lateral corners angular. Side-plate 4 

 larger than 2^ and 3'^ combined. Pleon segment 3, postero-lateral corners rather 

 acute. Eyes round, dark red. Antenna 1 in Q rather longer than antenna 2, 

 scarcely so in c?, 1*** Joint not so long as 2*^, flagellum slender, longer than pe- 

 duncle. Antenna 2, ultimate and penultimate joints of peduncle subequal, stronger 

 in ö than in 9 , with flagellum shorter. Gnathopod 1 feeble, 4"^ Joint not 

 broadly produced, ^^^ setose, little longer than the fusiform 6^^ Gnathopod 2 

 rather powerful, 4*^ Joint not cup-shaped, 6^^ in § triangulär oval, palm somewhat 

 oblique, near the hinge of finger scarcely dentate, in the other half minutely, 

 being then defined by a strong tooth and 2 spines; in the ö larger, having 

 the minute dentation replaced by a deep and rather wide excavation bounded 

 by a Sharp tooth. Peraeopods 1 — 5 rather slender, 4*^^ Joint not greatly 

 expanded or much decurrent even in peraeopods 4 and 5, which have the 2*^ Joint 

 oblong oval. Uropod 3 rather slender, peduncle with 4 spines, subequal to 

 ramus, in which 1^* Joint is longer than the 2'^. Telson oblong oval, distally 

 tapering to acute apex, 3 pairs of lateral spines. Colour whitish with scattered 

 red-brown patches; ova bluish. L. 6 mm. 



Arctic Ocean, Xorth-Atlantic and North-Sea (Xorway). 



13. M. leptoearpa 0. Sars 1882 M. l, G. 0. Sars in: Forh. Selsk. Christian., 

 nr. 18 p. 91 t. 4 f. 3, 3a | 1892 M. l, G. O. Sars, Crust. Norway, v. 1 p. 265 t. 93 f. 2 j 

 1893 M. l, A. DellaValle in: F. Fl. Neapel, u 20 p. 639 t. 59 f. 53. 



Body veiT slender, not much compressed. Head, lateral corners angular. 

 Side-plate 4 scarcely larger than 2^ and 3*^ combined. Pleon segment 3, postero- 

 lateral corners little produced, rather obtuse. Eyes round. Antennae 1 and 2 

 subequal, rather short. Antenna 1, 1^* Joint scarcely as long as 2*^ and 3<^ combined, 

 flagellum shorter than peduncle. 9-jointed. Antenna 2, ultimate Joint of peduncle 

 shorter than penultimate, flagellum about half lengih of peduncle. Gnathopod 1 

 slender, longer than gnathopod 2, 5**^ Joint extremely narrow and elongated, 

 6*^ much shorter, nan'owly oblong but widening distally, the small palm nearly 

 transverse, defined by a small tooth. Gnathopod 2 powerful, 6*^ Joint broadly 



