312 Neopleustes 



Synopsis of species: 

 Dorsum with teeth — 2. 



^ Dorsum without teeth — 3. 



I 



{Dorsum with 5 or more teeth 1. N. pulchellus . . p. 312 



Dorsum with 3 teeth 2. N. boeckii . . . p. 312 



Dorsum with 2 teeth 3. N. bicuspis . . . p. 313 



Dorsum with 1 tooth 4. N. monocuspis . p. 313 



j Antenna 1 short ö. N. brevicornis . p. 313 



I Antenna 1 elongate --4. 



i Gnathopods 1 and 2 feeble 6. N. assimilis . . p. 314 



I Gnathopods 1 and 2 moderately strong 7. N. bairdi . . . . p. 314 



1. N. pulchellus (Kreyer) 18i6 Amphitoepulchella., Kreyer in: Voy.'Nord^CTuat. 

 t, 10 f.2a — r I 1859 Paramphithoe p., 11. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 

 nr. 1 ]). 70 I 1887 Rp., H. J. Hansen in: Vid. Meddel., ser. 4 v. 9 p. 119 t. 5 f. 2— 2b j 

 1893 P.p., G. 0. Sars, Crust. Norway, v.l p. 346 t. 122 f. 1 | 1862 Pherusa p., Bate^ 

 Cat.Ampliip. Brit.Mus., p. 143 t. 27 f. 5 | 1876 Plenstes pulcheüus (part.), A. Boeck, Skaiid. 

 Arkt. Amphip., v.2 p. 306 (not fig.) | 1893 Acanthozone pulchclla (part), Ä. Delhi Valle 

 in: F. Fl. Neapel, «.20 p.605 t. 59 f. 18 | 1876 Pleustes euacanthiis, G. 0. Sars in: Arch. 

 Naturv. Kristian., v.2 p. 256 | 1885 Paramphithoe euacantha, G. 0. Sars in: Xorske 

 Nordhavs-Exp., v. 6 Crust. I p. 168 t. 14 f. 3. 



Sharp compressed teeth on peraeon segments 5 — 7, sometimes alsa 

 on 4*^* and others; similar teeth on pleon segments 1 and 2, an upturned 

 lamellar expansion on segment 3. Head produeed to rather broad blunt 

 rostrum, post-antennal corners spiniform. Side-plate 1 tapering to blunt 

 point. a little seiTate behind, 2*^ more rounded apically, also serrate, bind 

 margin of 4**i very oblique, acute below emargination. Pleon segment 3, 

 postero-lateral angles acutely produeed, slightly upturned, bind margin straight, 

 finely serrulate. Eyes moderate, irregulär oval, dark red., Antenna 1 very 

 long, P*' Joint as long as 2^ and 3^ combined, flagellum 4 to 5 times as 

 long as peduncle, with 90 joints, P* longer than 3*^ Joint of peduncle. 

 Antenna 2 scarcely ^U as long as antenna 1, ultimate and penultimate joints 

 of peduncle equal, flagellum about twice as long as peduncle. Gnathopods 1 

 and 2 rather feeble, 5*^ Joint rather long, little expanded, 6*^* Joint longer, 

 oblong oval, widening distally a little. palm shorter than bind margin, 

 forming with it a very obtuse angle. Gnathopod 2 the stronger. Peraeo- 

 pods 1 — 5, finger strong, curved; peraeopods 3—5, 2*^ Joint oblong oval, 

 serrulate behind. üropod 3, inner ramus long, outer more than 7? as long, 

 much longer than peduncle. Telson very small, oval, with small dentiform 

 projection on each side near apex. Coiour whitish, pellucid, mottled with 

 dark brown. L. Q reaching 17 mm. 



Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Greeuland, Iceland, 

 Spitzbergen, Norway, Bohuslän). Depth 75 — 282 m. 



2. N. boeckii (H. J. Hansen) 1876 Pleustes pulchellus (part.) (err., non Amphitoe 

 pulchella Kroyer 1846!), A. Boeck, Skand. Arkt. Amphip., v.2 t.23 f . 1 (not text) | 1893 

 Acanthozone pulchella (pari), A.Della Valle in: F. Fl. Neapel, u20 p.605 | 1887 Param- 

 phithoe boeckii, H. J. Hansen in: Vid. Meddel., n. ser. 4 v.9 p. 121 t. 5 f. 3 — 3b | 1893 

 P. b., G. 0. Sars, Crust. Nonvay, v. 1 p. 348 t. 122 f. 2. 



Sharp compressed teeth ouly on peraeon segment 7 and pleon segments 1 

 and 2. Head produeed to strongly carinate acute rostrum, post-antennal 

 Corners little produeed. Side-plates not serrate, 1^* apically rounded. Pleon 

 segment 3, postero-lateral angles acutely produeed, bind margin convex. 



