Metopii 179 



oval, palm sraooth, eouvex, rather oblique, cletiiied by a sharp tooth, Peraeo- 

 pods 1 and 2 little unequal, peraeopods 3 — 5, 4*^' joiut not greatly expanded, 

 in peraeopod 5 produced below middle of 5^^^ ^'^ Joint of peraeopod ö oblong 

 oval. Uropod 3, peduncle witb 2 spinules, longer than 1^* Joint of ramus, 

 2*^ as long as l''*. Telson unarnied, rather broadly oval, apex obtuse. L. 9 4 mm. 



Nnrth-Atlantic (^Christiiinsund [West-Norway |). Doptli 110- 146 m. 



14. M. longicornis Boeck 1871 M. l., A. Boeck in: Forli. Selsk. Christian., 

 1870 p. 143 I 1876 M. l, A. Boeck, Skand. Arkt. Ampliip., v.2 p. 460 t. 19 f . 1 j 1887 

 M.l, H. .J.Hansen in: Vid. Meddel., ser. 4 ».9 p. 97 t. 4 f. 1,1a i 1892 M.l, G. O. 

 Sars, Criist. Xorway, r. 1 p. 258 t. 90 f. 2 1 1893 M. l, A. Delhi Valle in: F. FL Neapel, 

 V. 20 p. 641. 



Body slender. Head, lateral corners bluntly produced. Side-plate 4 as deep 

 as broad, rather larger than 2^ and 3*^ combined. Pleon segment 3, postero- 

 lateral corners produced bnt not very acutely. Kyes round, rather large. 

 Antennae 1 and 2 subequal, rather long. Antenna 1, P* and 2*^ joints long, sub- 

 equal, flagellum scarcely longer than peduncle, with 10 joints (20, Sars in text). 

 Antenna 2, ultimate Joint of peduncle as long as flagellum, rather shorter than 

 penultimate. Gnathopod 1, 6*^ Joint as long as 5**^ subfusiform. with a row of 

 seven minute spinules ou vorhat may be considered the palmar part of the bind 

 margin. Gnathopod 2 comparatively feeble, scarcely longer than gnathopod 1, 

 6*^1 Joint oblong ti'iangular, palm oblique, smooth, defined by a small tooth. 

 Peraeopods 1 — 5 rather sleuder, 4*^'* Joint little decurrent, sublinear; 2*^ rather 

 naiTOwly oval in peraeopod 4, more broadly so in peraeopod 5, with bind 

 margin rather abruptly curved in the middle. Uropod 3, peduncle with 

 3 spines, nearly as long as ramus, the joints of which are subequal. Telson 

 with 3 pairs of lateral spines, narrowly oval, blunt at apex. L. Q 4 mm. 



Arctic üeean. North-Atlantic and Cliristianiafjord (Norway; Greenland, depth 

 .56-1 12 ni). 



15. M. pusilla 0. Sars 1892 M.p., G. Ü. Sars, (Jrust. Norway, v. 1 p. 256 t. 90 f. 1. 



Body Short, compressed. Head, lateral corners sharply angular. Side-plates 

 very large, 4*^ nearly as deep as broad, rather larger than 2^ and 3*^ combined. 

 Pleon small. Pleon segment 3, postero-lateral corners little produced but 

 acute. Eyes minute, round, dark red. Antennae 1 and 2 rather sleuder and 

 tolerably long, though shorter than in M. longicornis. Antenna 1, 2^ Joint 

 scarcely shorter than 1^*, flagellum longer than peduncle, 11-jointed. Antenna 2 

 scarcely shorter than antenna 1, ultimate and penultimate joints of peduncle 

 subequal, slender, flagellum shorter than the 2 together, 9-jointed. Gnathopod 1 

 rather feeble, 6*11 Joint decidedly shorter than 5*'\ sublinear. Gnathopod 2 

 moderately strong, 6*^ Joint oblong triangulär, widening distally, palm somewhat 

 ^)blique, nearly straight, slightly serrated, defined by an acute tooth; in ö 

 rather longer than in 9 '. Peraeopod 1 rather slender and elongated, the 

 others stouter, 3 — 5 successively shorter, the tinger strong and curved. 

 Peraeopod 5, 2'^ Joint rather a short broad oval, 4*^ produced beyond middle 

 of 5*^. Uropod 3, peduncle with 2 spines, scarcely longer than 1^* Joint 

 of ramus, and subequal to the 2*^. Telson with 2 paii'S of lateral spines, 

 oblong oval. Colour whitish with stellate brownish gi-ey patches, side-plates 

 also tending to gTeenish. L. 9 3 mm. 



North-Atlantic, North-Sea and Skagerrak (West- and South-Norway). In shallow 

 water among Algae and Hydroids. 



