Orchestia 539 



16. O. nitida Dana 1852 0. n., J. D. Dana in: P. Amer. Ac, v.2 p.204 | 1853 

 & 55 O.n., J. D. Dana in: U. S. expl. Exp., u iBii p.868; t. 58 f. 5a— f (f. 6a— d?) | 

 1862 0. n. -\- 0. fuegensis, Bäte, Cat. Amphip. Brit. 3Ius., p. 29 t. 5 f. 1; p. 17 t. la 

 f. 2 I 1893 0. gammarellus (part.) -f- 0. chiknsis (part.), A. Della Valle in: F. Fl. Neapel, 

 V. 20 p. 499, 498. 



Body compressed. Side-plates of moderate size, 5*^^ decidedly less 

 deep than 4^^. Pleon segmeut 3, postero-lateral corners sligbtly recurved. 

 Eyes round. Antenna 1 reacbing end of peDultimate Joint of peduncle of 

 antenna 2 (Dana) (Bäte: beyond it), flagellum 5-jointed. Antenna 2 shorter 

 than half the body (Dana); peduncle short, ultimate and penultimate joints 

 subequal, flagellum 14- or 15-jointed, flattened. Gnathopod 1 in ö, 5^^ Joint 

 considerably longer than 6*^, with subapical process, 6*^ apically widened, 

 obliquely truncate (Dana), the obliquity slight in the figure; finger not quite 

 reacbing extremity of apical process. Gnathopod 2 in (5, 6*^ Joint large, 

 subovate, palm straight, nearly longitudinal, with terminal groove for apex 

 of long finger (Dana), oblique (Bäte). Gnathopod 1 in Q , 6^^ Joint narrowly 

 oblong, finger overlapping the short palm (Bäte; not observed by Dana). 

 Gnathopod 2 in Q , 4^^ Joint with scabrous apical process, 5*'^ with free 

 bind margin bulging, 6*'^ narrowly produced beyond the longitudinal finger. 

 Peraeopods 4 and 5 with numerous short spines on the slender ö^^ and 6*^ 

 Joints. Uropod 1, outer ramus with only apical spines. Colour green. 

 L. about 8 — 12 mm. 



Tierra del Fuego (among floating Fucus, near the shores); Port Famine. 



17. O. humieola Marts. 1868 0. h., E. v. Martens in: Arcli. Xaturg., r. 34i 

 p. 56 I 1888 O.k., T. Stebbing in: Rep. Voy. Challenger, ?;. 29 p. 384 | 1892 O.k., M. 

 AVeber, Reise Niederl. O.-Ind., v.2 p. 569 | 1893 0. h., A. Della Valle in: F. Fl. Neapel, 

 V.2Ü p. 509. 



Side-plates 1 — 4 comparatively large, rounded, the 5*^ somewhat less deep 

 and much narrower than the 4*^ Pleon segment 3, postero-lateral corners 

 quadrate, margin above irregularly serrulate. Eyes long-oval, rather more 

 than the smaller diameter apart. Antenna 1, flagellum shorter than peduncle, 

 3— 5-jointed, Antenna 2 half as long as body, flagellum as long as peduncle, 

 12 — 15-jointed. Gnathopod 1 in ö, 5*'^ Joint with inconsiderable distal 

 convexity, 6*^ distally widened, palm sinuous, finger strong, reacbing end 

 of apex of 6^^ Joint. Gnathopod 2 in c?, 6*^ Joint strong, long-oval, palm 

 long, gently couvex, spinöse, oblique, finger long and strong, ending with 

 abruptly narrowed cylindrical apex, overlapping the palm. Gnathopod 1 in 9, 

 5^b Joint not very long, 6*^ not distally widened, palm very sliort, concave, 

 finger large, hooked, overlapping palm. Gnathopod 2 in o , 4*^ Joint distally 

 lobed. h^^ with free part of bind margin bulging, 6^^ not far nor yet broadly 

 produced beyond the little oblique palm. Peraeopod 5, 2*^ Joint rather 

 strongly serrate or crenulate on upper part of bind margiii. üropod 1, 

 rami considerably shorter than peduncle, outer ramus with only apical 

 spines. üropod 3, conical ramus as long as peduncle, with an apical spine. 

 L. uearly 8 mm. 



Japan. Among damp fallen leaves. 



18. O. floresiana M.Weber 1892 0. f., M.Weber, Reise Niederl. O.-Ind., v.2 

 ]). 562 f. 9—12. 



Pleon Segment 3, postero-lateral corners produced to a point, margin 

 above convex, smooth. Eyes round, somewhat less than the diameter apart. 



