182 Metopa, Metopella 



21. M. invalida 0. Sars 1876 M. alderii (part.), A. Boeek, Skand. Arkt. Araphip., 

 V. 2 p. 456 t. 17 f. 4, 4k I 1892 M. invalida, ö. 0. Sars, Crust. Norway, v. 1 p. 267 t. 94 f. 2. 



Body stout and coinpact. Head, lateral coruers obtusely projectiug, Side- 

 plate 4 broader thaii deep, much lärger than 2"^ and 3*^ combined. Pleon segment 3, 

 lateral corners rather produced. Eyes round, bright red. Antennae 1 and 2 

 subequal, short. Antenna 1, l*** Joint shorter tban 2'iand3'^ combined, flagellum 

 scarcely as long aspeduncle, 9-jointed. Antenna 2, ultimateandpenultimatejoints 

 of peduncle subequal, flagellum scarcely longer tban ultimate. Gnathopod 1, 

 6*^joint as long as 5*'\ narrow. tapering, witb a Single spine about in middle of 

 bind margin. Gnathopod 2 rather feeble, 5**^ Joint widely cup-like, setose 

 at rather produced apex. 6*** oblong quadrangular, slightly dilated distally, 

 palm nearly straight, quite smooth, slightly oblique, forming obtuae angle 

 with bind margin. Peraeopods 1—5 rather sleuder, but 2*^ Joint of peraeo- 

 pod 5 rather broad, oval quadrangular, and 4*^' Joint produced beyond middle 

 of ö*'^. Uropod 3, peduncle with 2 spiuules, shorter than ramus, of which 

 the joints are subequal. Telsou unarmed. 3 times as long as broad, a little 

 consti'icted above, apex obtusely pointed. Colour pale greyish white, with 

 transverse yellowish bands; ova bluish. L. Q 4 mm. 



Arctic Ocoan (Haimnorfest aiul Selsövig [North-Norway]). Depth 74 — 92 m. 



2. Gen. Metopella 0. 8ars 



1871 Metopa (part.), A. Boeck in: Forh. Selsk. CIhristian., 1870 p. 140 i 1892 

 Metopella, G. 0. Sars, Criist. Norway. t;. 1 i).274 | 1893 Proboloidcs (part.) + Metopoides 

 (part.), A. DellaValle in: F. Fl. Neapel, c.20 p. 907. 



Antennae 1 and 2 not veiy long nor very unequal, with or without 

 accessory flagellum to antenna 1. Mandibular palp, 3*^ Joint small. Maxiila 1, 

 palp (at least sometimes) 2-jointed. Maxillipeds, inner plates not very small, 

 separate (at least sometimes), outer plates very small (mouth-organs ascertained 

 for M. nasuta and M. nasutigenes). Gnathopod 1 simple or subchelate. 

 Gnathopod 2 subchelate. Peraeopods 3 — 5, 2*^ Joint little or not at all 

 expanded. üropod 3, peduncle shorter than ramus. 



6 species. 



Sj'nopsis of sjjecies: 



Antenna 1, ist joint strongly produced over 2*1 — 2. 



Antenna 1, ist joint not produced — 3. 

 ) Peraeon segment 4 conspicuously carinate .... 1 . M. nasuta . . . p. 182 

 \ Peraeon segment 4 not conspicuously carinate . . 2. M. nasutigenes . p. 183 



I Peraeopod 5, 2d joint without expansion 3. M. ovata . . . . p. 183 



\ Peraeopod 5, 2d Joint not without expansion — 4. 



I Peraeopod 5. 2d joint with convex expansion above 4. M. neglecta . . ]). 184 



\ Peraeopod 5, 2d joint with slight linear expansion — 5. 



) Peraeon segment 4 carinate 5. M. carinata . . p. 184 



) Peraeon segment 4 not carinate 6. M. longimana . p. 185 



1. M. nasuta (Boeek) 1871 Metopa n., A. ßoeck in: Forh. Selsk. Christian., 

 1870 p. 144| 1876 M. n., A. Boeek, Skand. Arkt. Amphip.. r. 2 p. 465 1. 18 f. 6 \ 1887 

 M. n.?, H. .). Hansen in: Vid. Meddel., ser. 4 u 9 j). 102 \ 1893 M. n. (part.), A. Della 

 Yalle in: F. Fl. Xeaxiel, t. 20 p. 637 | 1892 M. 7i., Metopella (part.). G. 0. Sars, Crust. 

 Norway, v. 1 p. 276 t. 98 f. 1. 



liody Short, compact and firm. Peraeon segment 4 much the largest, 

 with rounded dorsal carina. Head, lateral corners truncate.. Side-plate 2 



I 



