Atylus, Nototropis 329 



obtuse äugle, fiuger rather sliort and stout. Gnathopod 2 similar, rather 

 longer. Peraeopod 1 longer than peraeopod 2, 4*^ Joint in both rather stout. 

 Peraeopods 3 and 4, 2*^ Joint not very wide, narrowing distally. Peraeopod 5, 

 2*^ Joint broader than long, bind lobe produced, delined by a noteh in front, 

 finger short and stout as in peraeopods 3 and 4, in all 3 easily reversed. 

 Uropod 2 niuch shorter than uropods 1 and 3, the outer ramus a little 

 shorter (Boeck: a little longer) than the inner. Uropod 3, peduncle very 

 Short, rami long, fringed with slender setae. Telson oval triangulär, small, 

 longer than broad, cleft nearly to base, tapering to obtuse apices, each 

 can-ying a spinule. Colour whitish with red spots? L. 32 — 43 mm. 



Arctic Ocean (widely distributed ; north of Norway, in storaach of Liparis 

 moutagui Donov.). 



2. Gen. Nototropis A. Costa 



1853 Nototropis, Notrotopis (Sp. un.: N. spinulicauda), A.Costa in: K,end. Soc. 

 Borbon., n. ser. v. 2 p. 170, 173 j 1859 Paramphithoe (part.), R. M. Bruzelius in: Svenska 

 Ak. Handl., n. ser. v. 3 nr. 1 p. 68 | 1861 Epidesura (Sp. typ. : Ämphithoe compressa), 

 A. Boeck in: Forh. Skand. Xaturf., Mede 8 p. 659 | 1893 Faratylus, G. O. Sars, Crust. 

 Norway, v. 1 p. 462. 



Body strongly conipressed, carinate. Pleon segment 4 dorsally produced 

 with antecedeut notch. Head rostrate, lateral margins sinuous. Side-plates 1 — 4 

 of moderate size, generally smaller in d than in § , 5^^ with front lobe 

 the deeper. Anteuna 1 the shorter, without accessory flagellum, both pairs 

 elongate in d. Mandible (Fig. 77 p. 333) normal, palp slender, feebly armed. 

 Maxilla 1 see fig. 78 (p. 333), maxilla 2 as in Atylus. Maxillipeds, outer plates 

 fully reaching or passing end of palp's 2^ Joint, palp slender. Gnathopod 1 

 rather stouter and shorter than gnathopod 2, 6^^ Joint oval, densely spinöse 

 in front; 5*^' Joint in both pairs elongate triangulär, palra oblique. Peraeopod 1 

 longer than peraeopod 2, peraeopod 3 short, with 2«^ Joint piriform, peraeo- 

 pods 4 and 5 longer, subequal, 2<i Joint in peraeopod 5 widely expanded, 

 finger in peraeopods 3 — 5 sometimes reversed. Branchial vesicles often 

 pleated. Uropods 1 and 2, outer ramus the shorter. Uropod 3, rami sub- 

 equal, lanceolate, spinulose. Telson short, deeply cleft, apices subtruncate. 



7 species accepted, 1 obscure. 



Synopsis of accepted species: 



j Peraeopod 1, finger very large 1. N. falcatus p. 330 



) Peraeopod 1, finger not very large — 2. 



I Pleon Segments 1 — 3 without dorsal teeth . . 2. N. STvammerdamei . p. 330 



) Pleon Segments 1 — 3 with dorsal teeth — 3. 



{Peraeopod 5, 2<i Joint with lower hind corner 

 triangularly produced — 4. 

 Paraeopod 5, 2*1 Joint with lower hind corner — 



not triangularly produced — 6. 



j Branchial vesicles simple 3. M". vedlomensis . . . p. 331 



\ Branchial vesicles not simple — 5. 



(Eyes large, reniform; a spinulose hump on 

 composite segment of pleon 4. N. guttatus p. 331 



\ Eyes small, i-ound; no spinulose hump on 



' composite segment of pleon 5. N. nordlandicus . . . p. 332' 



(Post-antennal corners not produced; uro- 

 pod 3, rami very long 6. N. smitti p. 332^ 



\ Post-antennal corners produced; uropod 3, 



* rami not very long 7. N. homochir . . . . p. 333- 



