Metopa 175 



rather longer thau penultimate, flagellum 7-jointed. Gnathopod 1 slender, 

 2*^ Joint naiTOw, 4*^ rather long, narrowly and triangularly produced, ö*^^ 

 long, linear, 6**^ narrower and rather shorter, finger short, scale-like, fringed 

 closely within with long curved setae. Gnathopod 2 powerful, 5*^ but not 

 4*"^ Joint cup-shaped, 6**^ oblong quadrangular, palm transversa, gently concave, 

 obscurely crenulate, defined by a broad setose lobe slightly emarginate at 

 tip, finger ending with a small hook. Peraeopods 1 — 5 nearly as in 

 M. robusta (p. 173), but rather less strong. Uropod 3, peduncle with 3 spines, 

 nearly as long as ramus, of which the 2"^ Joint is nearly as long as the 1^*. 

 Telson oval, obtusely pointed, with 2 or 3 pairs of lateral spines. L. 5 mm. 



Arctic Ocean (Hammerfest [Finmark]). 



6. M. clypeata (Kreyer) 1842 Leucothoe c, Kreyer in: Naturh. Tidsskr., v.4 

 p. 157 I 1845 L.c, Kreyer in: Naturh. Tidsskr., ser. 2 v. i p. 545 t. 6 f. 2a— £11846 

 L. c, Kreyer in: Yoy. Nord., Crust, t. 22 f. 2a — o | 1862 Montaguac, Bäte, Cat. Amphip. 

 Brit. Mus., p. 58 t. 9 f . 4 | 1871 Metopa c, A. Boeck in: Forh. Selsk. Christian., 1870 

 p. 140 I 1876 M. c. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p. 451 t. 18 f. 4; 

 t.l9 f.3 I 1887 M.c, H.J.Hansen in: Vid. Meddel., ser. 4 v.9 p.90 t.3 f.3— 3b | 1893 

 M. c, A. DellaYalle in: F. Fl. Neapel, v.20 p. 638 t. 59 f. 50, 51. 



Body somewhat compressed, strong. Side-plate 4 much broader than deep, 

 much larger than 2*^ and 3^ combined. Pleon segment 3, postero-lateral coruers 

 subquadrate. Eyes very small, round. Anteuna 1 very long, 1^* Joint long, 

 a little longer than 2*^, flagellum slender, twice as long as peduncle, 25-joiuted. 

 Antenua 2 rather shorter than antenna 1, ultimate and penultimate joints of 

 peduncle subequal, flagellum less than half leug-th of peduncle, 12-jointed. 

 Maxilla 1 with large 1-jointed palp. Maxillipeds, inner plates separate (?). 

 Gnathopod 1, 4*^ Joint broadly produced and setose, o*^ long, tapering, 

 fringed with long setae on the bind margin, 6*^^ much shorter, linear, little 

 curved, with setae on fi'ont and apical part of bind margin, finger rudi- 

 mentary, with a comb of graduated spines. Gnathopod 2 stoutly built, 

 6*^ Joint very large, longer than the 1*^*, oblong oval widening distally, 

 palm fiuely serrate, slightly convex and oblique, defined by a strong tooth. 

 Peraeopod 1 more slender than peraeopod 2, which resembles peraeopod 3. 

 Peraeopod 5, 2*^ Joint shorter and broader, also 4*^ with the laminar part 

 shorter and broader, but the produced part longer than in peraeopod 4 

 (according to Kr0yor's text and to the fig. 3 b of Hansen, but not according to 

 Kr0yer's fig. and Boeck's fig. 4n). üropod 3 stout, peduncle with some spinules, 

 not quite so long as the 2 subequal joints of the ramus. Telson oval, obtuse 

 at apex, figured by Boeck with 2 pairs of lateral spines. L. 6 — 8 mm. 



Arctic Ocean and North-Atlantic (Greenland; Bell Sound [Spitzbergen]?). 



7. M. alderii (Bäte) 1857 Montayua a., Bäte in: ^nn. nat. Hist., ser. 2 ?;. 19 

 p. 137 I 1862 M. a., Bäte, Cat. Amphip. Brit. 3Ius., p. 57 t. 8 f. 6 [ 1871 Metopa a., 

 A. Boeck in: Forh. Selsk. Christian., 1870 p. 141 | 1892 M. alderi, G. 0. Sars, Crust. 

 Norway, v.l p. 250 t. 86 1 1893 M. alderii, A. DellaValle in: F. Fl. Neapel, i\20 p. 638 

 t. 59 f. 52 I 1874 Stenothoe alderi, M'Intosh in : Ann. nat. Hist., ser. 4 v. 14 p. 265. 



Body rather compressed, but back broadly rounded. Head, lateral corners 

 broadly truncate. Side-plate 4 much larger than 2*^ and 3*^ combined. Pleon 

 segment 3, postero-lateral corners quadrate. Eyes large, round oval, dark red. 

 Antenna 1 much shorter than antenna 2, l*** Joint as long as 2^ and 3*^ combined, 

 flagellum in 9 , but not in d, longer than peduncle. Antenua 2 strong, especially 

 in (S, ultimate Joint of peduncle almost or quite as long as penultimate and 



