538 Orchestia 



to which the finger tip is applied; finger with prominence which closes down 

 immediately beliind central tooth of palm. Peraeopods 1 — 3 successivelj larger, 

 peraeopod 5 a little longer than peraeopod 4. L. 13 mm. 



Cook Strait (Isle of Kapiti). 



W. O. selkirki Stebb. 1888 0. s., T. Stebbiug in: Rep. Yoy. Challenger, d. 29 

 p. 603 1. 1, 2 I 1893 0. gammareUus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.499. 



In general closely resembling 0. gammarelliis (p. 532). Antenna 1 in d, 

 flagellum 8- or 9-jointed, in o 6-jointed. Antenna 2 in d, flagellum reaching 

 28 joints. Maxillipeds, a tubercle represeuting 4^^ Joint of palp. Gnathopod 1 in 5 , 

 see Fig. 93 (p. 530). Gnathopod 2 in d, 6**^ Joint very large, widest near 

 base, narrowing slightly to the very sinuous, spiniferous palm, the strong 

 finger having inner margin divided into 2 concave Spaces, the first closing 

 over the little concavity and great convexity of the palm, the second leaving 

 a narrow space between itself and the remainder of the palm, which ends 

 in a groove for receiviug the finger tip. Gnathopod 2 in 9 , 2'^ Joint not 

 greatly wideued, narrowing downward, 6*^^^ Joint broadly produced beyond 

 the minute, obliquely placed finger. Peraeopod 5, 4^^ and 5*^ joints in 

 both sexes long and narrow. Uropod 3, ramus about as long as peduncle. 

 Telson as broad as long, spinulose, the narrow apex a little emarginate. 

 L. 13—17 mm. 



South-Facific (Juan Fernandez). Shore. 



15. O. pickeringii Dana 1853 & 55 0. p., 0. pickerhigi, J. D.Dana in: U. 

 S. expl. Exp., «?.13ii p.882, 1595; t.59 f. 9 ((?) | 1862 0. pickeringii, Bäte, Cat. Amphip. 

 Brit. Mus., p. 32 t. 5 f . 6 | 1879 0. macleayana, Haswell in: P. Linn. Soc. N. S.Wales, 

 V. 4 p. 250 t. 7 f . 2 I ? 1885 Allorchestes crassicornis var. coogeensis, Chilton in : P. Linn. 

 Soc. N. S. Wales, v. 9 p. 1035 t. 46 f. 1 a, b | 1893 Orchestia gammareUus (part.), A. 

 Della Valle in: F. Fl. Neapel, v. 20 p.499. 



Body not very stout. Side-plates not deep, 5*^^ nearly or quite as deep 

 as 4*^. Pleon segment 3, postero-lateral angles quadrate, with minutely 

 produced point. Eyes variable in size, shape and distance apart, dark. 

 Antenna 1 reaching end of penultimate Joint of peduncle of antenna 2, 

 3 joints of peduncle subequal in leugth, flagellum 4 — 6-jointed. Antenna 2 

 scarcely half as long as body, ultimate Joint of peduncle not greatly longer 

 than penultimate, both becomiug broad in d, flagellum longer (?) than 

 peduncle (Dana), with 12-joints, 1^* in 9 represeuting 3 or 4 coalesced. 

 Maxilla 1, palp very minute. Gnathopod 1 in d, o^^ Joint much longer 

 than 6*'\ with narrowly rounded pellucid process, 6*^ with broadly rounded 

 process, not overlapped by the finger. Gnathopod 2 in d, 6*^ Joint large, 

 ovate, palm with 2 (sometimes coalesced) convex spinulose processes, the 

 one near the finger-hinge much the broader (not in Dana's figure); finger 

 stout, evenly curved (in Dana rather sinuous), reaching recess formed by 

 advance of bind margin beyond 2*^ process of palm. Gnathopod 1 in Q , 

 6*'i Joint naiTOwly oblong, with small apical pellucid process, overlapped by 

 the finger. Gnathopod 2 in 9 , 2*i Joint well expanded above, 4*^ scarcely 

 lobed, 6*^ nearly as broad and long as o^\ the produced apex well rounded. 

 Peraeopod 5, 2*^ Joint as usual considerably broader than in peraeopods 

 3 and 4; 4*^ and 5*^ joints rather stout, cylindrical in peraeopods 4 and 5. 

 Pleopods very' slender. Uropod 1, outer ramus with spines only at apex. 

 Uropod 3 small, ramus shorter than peduncle. L. about 12 mm. 



Pacific (Hawaiianislands; California; New South Wales). Aniong decayingsea-weed. 



