534 Orchestia 



Syezda ßuss. Est., Syezda 1 Zool. p. 118 t. 8 f. 34— 39 j 1893 O.m., Chevreux in: Bull. 

 Soc. zool. France, D.IS p. 128 f. 2 | 1895 O.m., Chevreux in: Rev. biol. Xord France, 

 V.7 p. 158 I 1837 0. littorea (err., non Leach 1813/14!), H. ßathke in: Mem. pres Ac. 

 8t.-Petersb., v. 3 p. 371 t. 5 f. 1—6 | 1862 0. l. (part.). Bäte, Cat. Amphip. Brit. Mus., 

 p. 27 I 1893 0. gammarellus (part.), A. DellaValle in: F. Fl. Neapel, r. 20 p. 499. 



Extremely variable, by gradual transitions completel)^ united with 

 0. bottae (Czerniavski) ; still nearer to 0. gammarellus (p. 532) by the 

 expanded 4*^ and 5*^ joints in peraeopod 5 of adult ö. Finger of gnatho- 

 pod 2 in d powerfully arched at the hinge, with a projection in middle of 

 inner margin, which becomes very prominently developed, forming a blunt tooth; 

 in Savigny's figure (in: Descr. Egypte) the 6*'! Joint has the palm defined 

 by an obvious tooth, which other authors do not represent. L. 15 mm (Rathke). 



Mediterranean and Black Sea. 



5. O. tuenrauna Fr. Müll. 1864 0. t., 0. tucuratinga, Fritz Müller, Für Darwin, 

 p. 54 f. 50, 51 I 1893 0. gammarelhis (part.). A. Della Valle in: F. Fl. Neapel, i\ 20 

 p. 499, 510. 



ö (young, but mature). Antenna 2 slender, joints of flagellum distinct; 

 gnathopod 2 with palm uniformly convex, peraeopod 5 slender and like 

 peraeopod 4; subsequently 2, 3 or 4 proximal joints of flagellum of antenna 2 

 are fused together, gnathopod 2 acquires a deep emargination in palm close 

 to the finger-hinge and a process of the finger fitting this cavity, while the 

 4^'i and 5*^ joints of peraeopod 5 are swelled to a considerable incrassation. 

 The figure of gnathopod 2 in d" shows a very broad 6*^ Joint, with spinulose 

 palm, slightly oblique, not defined by any tooth. The figure of gnathopod 2 

 in o shows a well expanded 2^ Joint, 5*'^ bulging, not much longer than 

 6^^\ which is broadly rounded at apex and little produced beyond the minute 

 longitudinal finger. L.? 



Brazil? 



6. O. bottae M.-E. 1840 0. b.. H. Milne Edwards, Hist. nat. Crust., v.3 

 p. 17 I 1851 O.b., F.Brandt in: Bull, phys.-math. Ac. St.-Petersb., v.9 p. 141 j 1868 

 0. b. -\- ?0. b. var. feminaeformis (juv.), Czerniavski in: Syezda Russ. Est., Syezda 1 

 Zool. p.ll7 t.8 f. 28, (29?), 30—32 | 1865 0. cavimana, Cam. Heller in: Verh. Ges. Wien, 

 v.lö p. 979 t. 17 1 1879 O.e., Hoek in: Tijdschr. Nederl. dierk. Ver., «.4 p. 131 t. 9 

 f. 8— 10 i 1881 O.e., Nebeski in: Arb. Inst. Wien, ».3 p. 142 t.2 f. 10 etc.; t. 3 f. 21 etc. | 

 1895 0. bottae -\- 0. c, Chevreux in: Rev. biol. Nord France, v. 7 p. 156 f. 1—4; p. 158. 



Closely related to 0. grillus (p. 540). Eyes roundish. Antenna 1, 

 joints of peduncle successively longer, flagellum 6-jointed. Antenna 2 less 

 than 7-2 äs long as body, flagellum 14 — 22-jointed. Gnathopod 1 in d, 

 5*^ and 6^^ joints strongly produced at hinder apex; also the 4^^ Joint has 

 at least sometimes a small prominence at hinder apex; finger overlapping 

 palm, but not reaching end of apical process. Gnathopod 2 in d, 6*^ Joint 

 large, broadly suboval, palm oblique, divided into 3 protuberances, the broadest 

 central, separated (in adults) by a deep excavation from that next finger- 

 hinge, and a shallow one from the small defining tubercle; finger long, with 

 margin bulging at a point corresponding to excavation in palm. Peraeopod 5, 

 4**^ and 5*^ joints not specially widened at any stage. Colour very dark, 

 almost black (Heller). L. 12 — 21 mm. 



Black Sea; Palestine; Cyprus (31t. Olympus, 1255 m above sea-level); Holland 

 (in garden remote from sea): France. 



7. O. traskiana Stinips. 1857 O.t., Stimpson in: P. Calif. Ac, i-. 1 p.90 I 1857 

 O.t., Stimpson in: Boston J. nat. Hist., u6 p. 517 ] 1862 0. t.. Bäte, Cat. Amphip. Brit. 

 Mus., p. 19 t. 3 f. 4 I 1893 0. t, A. Della Valle in: F. Fl. Neapel, v. 20 p. 510. 



