Sympleustes 319 



Rather slender, siuootli. Head, rostrum not large but distinct, lateral 

 Corners acute, post-antennal corners projecting spiniform. Side-plates 1 — 3 

 with tooth at lower bind corner, 5*^ with bind lobe little deeper than 

 front. Pleon segment 3, postero-lateral angles forming a little recurved 

 tooth. Eyes moderate, rounded oval, davk red. Antenna 1, V^ Joint mucb 

 longer than 2"^ and 3*^ combined, with spiniform apical process, flagellum 

 more than thrice as long as peduncle, 1^* Joint long. Antenna 2 mucb 

 sborter, ultimate Joint of peduncle longer than penultimate, flagellum not 

 twice as long as peduncle. Upper lip not very unsymmetrical. Mandible, 

 3<^ Joint of palp not greatly longer than *^^. Maxillipeds, 3^ joint of palp 

 shorter than 2'^, not apically produced. Gnathopods 1 and 2 not large, nor 

 very unequal, 5*^ Joint mucb shorter than 6^'S lobe narrowly rounded, densely 

 setose, 6*^ oblong oval, palm very oblique, mucb longer than bind margin, 

 defined by fascicles of sti'ong spiues. Peraeopods 3 — 5. 2*^ Joint regularly 

 oval, serrulate behind. üropod 3, outer ramus more slender than inner, less 

 than % of its length. Telson oval, nearly twice as long as broad. Colour 

 generally wbitish, marbled with reddish brown patches. L. o about 6 mm. 



Arctie Ocean, North-Atlantic, North-Sea aud Skagerrak (Greenland, Spitzbergen, 

 Iceland, Murmen Coast, Norway); Kattegat. 



5. S. pulchellus (0. Sars) 1876 Amphithopsis pulchella, G. 0. Sars in: Arch. 

 Naturv. Kristian., v.2 p. 258 | 1885 A. p., G. 0. Sars in: Norske Nordhavs-Exp., r. 6 

 Orust. I p. 175 t. 14 f. 6 I 1893 Parapleustes pulchellus, G. 0. Sars, Crust. Norway, v. 1 

 p. 359 t. 12() f. 2 I 1899 Amphithopsis pulchella, 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. 



Not very slender, smooth. Head, rostrum very small, lateral corners 

 angular, post-antennal corners little produced. Side-plates 1 — 3, denticle 

 nearly obsolete, 4* narrow below, 5*^ and 6***, bind lobe mucb deeper than 

 front. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes 

 moderate, reniform, bright red. Antenna 1, 1*** Joint scarcely longer than 

 2^ and 3*^ combined, not produced, flagellum about thrice as long as peduncle, 

 1^* Joint long. Antenna 2, ultimate and penultimate joints of peduncle sub- 

 equal, flagellum not nearly twice as long as peduncle. Gnatbopod 1 rather 

 slender, o*"^ Joint nearly as long as 6*^, lobe broad, setose, 6*^ slightly 

 widening distally, palm mucb shorter than bind margin, imperfectly defined 

 between 2 sets of 3 small spines. Gnatbopod 2 mucb strenger, not mucb 

 longer, 5*^ Joint sbort, lobe naiTOw, setose, 6*^ slightly widening distally, 

 palm rather sinuous, slightly oblique, mucb shorter than bind margin, well 

 defined between 2 sets of 3 strong spines. Peraeopods 3 — 5, 2*^ Joint large 

 oval, smooth behind. üropod 3, outer ramus about -/g as long as inner, 

 both with few marginal spines. Telson rather small; distinctly boat-shaped, 

 apex narrowly obtuse. Colour wbitish with small pinkisb spots all over. 

 L. 9 7 mm. 



Arctie Ocean (Greenland, Spitzbergen, Iceland, Varangerfjord). Depth 94 — 877 m. 



6. S. olrikii (H. J. Hansen) 1887 Amphithopsis o., EL. J. Hansen in: Vid. 

 MeddeL, ser. 4 v.9 p. 136 t. 5 f. 5— 5 b | 1892 A. olriki, Parapleustes (part.), G. 0. Sars, 

 Crust. Norway, v.l p. 357 | 1899 A. olrikii, Sympleustes (part.), T. Stebbing in: Ann. 

 nat. Hist.. ser. 7 v.4 p. 209 | 1893 Acanthozone latipes (part.), A. DellaValle in: F.Fl. 

 Neapel, u20 p. 608. 



