318 Sympleustes 



rostrum sraall, lateral corners emarginate, post - antennal corners little 

 produced. Side-plates 1 — 3 without denticle, 1^*^ acute at lower front corner, 

 4*^ deep, narrow below, 5*'^ and 6*^^^ with bind lobe mach deeper tban front. 

 Pleon Segment 3. postero-lateral corners siibquadrate, obscurely produced. 

 Eyes rather large, oblong reniform, dark red. Antenna 1, P* Joint longer 

 tban 2*^ and ',V^ combined, apically somewhat produced, flagellum about tbrice 

 as long as peduncle, P* Joint longer tban 3'^ of peduncle, accessory flagellum 

 rudimentary (Bonnier). Antenna 2, ultimate Joint of peduncle longer tban 

 penultimate, flagellum little longer tban peduncle. Upper lip very uusymmetrical. 

 Mandible, 3<^ Joint of palp mucb longer tban 2*^. Maxillipeds, 3*^ Joint of 

 palp fully as long as 2*^, apically acutely produced. Gnatbopod 1 ratber 

 feeble, 5*^ Joint distally broad, as long as 6*^, palm well defined, equal to 

 bind margin and almost at rigbt angles to it, so tbat tbe Joint is sub- 

 triaugular. Gnatbopod 2 powerful, 5^^ Joint sbort, cup-like, 6*^ very large, 

 expanded distally, palm excavate between a small projection and a broadly 

 truncate lobe arraed witb 5 stout spines, tbe poiut of tbe finger closing into 

 a groove between tbese and a similarly armed surface ridge. Peraeopods 3 — 5 

 veiy strong, 2*^ Joint oval, bind margin quite smootb, nearly straigbt, 4*^ 

 and 5^*^ expanded, produced downward; all peraeopods spinöse, with finger 

 strong. üropod 3, outer ramus -/'s ^s long as inner. Telson distinctly boat- 

 sbaped, very small, apex evenly but not broadly rounded. Colour wbitisb, 

 transversely banded witb patcbes of dark brown, found also on peduncle of 

 antennae and on legs. L. g reacbing 12 mm. 



Arctic Ocean, North-Atlantic, North-Sea and Skagei-rak (Greeuland, Norway, 

 Great Britain), depth 56 — 830 m; Bay of Biscay, depth 1410 m. 



3. S. grandiiuanus (Chevreux) 1887 Ämphithopsis grandimana, Ghevreux in: 

 Bull. Soc. zool. France, v. 12 p. 570 | 1899 A. g., Sympleustes (part.), T. Stebbing in: 

 Ann. nat. Hist., ser. 7 v.-i p. 209 | 1893 Acanthozone latipes (part.), A. DellaValle in: 

 F. Fl. Neapel, v. 20 p. 608. 



Said to be near to S. pulcbellus. Compressed, pleon segments 1 — 3 

 sligbtly carinate. Head, rostrum very sbort, lateral corners rounded. Side- 

 plates not deep. Pleon segment 3, postero-lateral corners almost quadrate. 

 Eyes large, oval. Antenna 1 long, 2^ Joint almost as long as l^S 3^ half as long 

 as.2d, flagellum witb 53 joints, P* long. Antenna 2, -/g as long as antenna 1, 

 ultimate Joint of peduncle a little sborter tban penultimate, flagellum 29-joiuted. 

 Mandible, 3*^ Joint of palp very long. Gnatbopod 1, 6^^ Joint ratber sborter 

 tban tbe broadly oval 6*^. Gnatbopod 2, 6^^ Joint very large, elongate oval, 

 front margin witb sti'ong sbarp apical tootb, palm sligbtly crenulate, spinöse, 

 well defined by a strong tootb. Peraeopods 1 — 5 large, robust; peraeo- 

 pods 3 — 5, 2<^ Joint broadly oval, sligbtly produced downward, smootb bebind, 

 üropods 1 — 3 elongate, outer ramus only a little sborter tban inner. Telson 

 very sbort, rounded. L. 8 mm. 



North-Atlantic (Cape Fiuisterre). Depth 510 m. 



4. S. glaber (Boeck) 1861 Ämphithopsis g., A. Boeck in: Forh. Skand. Naturf., 

 Made 8 p. 662 | 1871 Paramphithoe glabra, A. Boeck in: Forh. Selsk. Christian., 1870 

 p.l75 I 1876 Pleustes glaber, A. Boeck, Skand. Arkt. Amphip., v.2 p.300 t.21 f . 1 | 1893 

 Farapleustes g., G. O. Sars, Crust. Norway, v. 1 p. 358 1. 126 f. 1 | 1899 Ämphithopsis g., 

 Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser. 7 vA p.209 | 1866 Paramphithoe 

 exigua, Goes in: Öfv. Ak. Förh., u 22 p. 523 t. 38 f. 12 | 1893 Acanthozone pulchella 

 (part.)?, A. DellaValle in: F. Fl. Neapel, u 20 p. 605. 



