558 Parorchestia 



than 5*^ widening distally into a scabrous boss, so that the finger does not 

 reach the end of the apical border but only that of the true palm, which is 

 ti-ansverse and setulose. Gnathopod 2 in d, 2^ Joint slightly widened distally, 

 5*^ small, triangulär, masked by 4*^^; 6*^ large, with the closed finger forming 

 a broad oval, palm rather oblique, nearly straight, with slight sinuosities, 

 fringed with spines, well defined but not by a tooth. Gnathopod 1 in Q , 

 expansions of 4*^ and 6*^ joints smaller than in d, 6*^^ narrow at base, 

 then rather wide, almost evenly oblong and smoothly margined to the palm, 

 which is nearly straight and transverse, with a finger reaching exactly to 

 the end of it and of the apical margin. Gnathopod 2 in 9, 2*^ Joint not 

 expanded, 4:^^ and 5*^ resembling those of gnathopod 1 in d, though a little 

 less robust, 6*^ nearly as long as 5*^ bind margin straight, produced in a 

 narrowly rounded lobe a little beyond the short, stout, acute finger and the 

 small, excavate, oblique palm. Peraeopods 1 — 5 rather short and compact, 

 finger small. Peraeopods 3—5, 2*^ Joint well expanded, as broad below as 

 above. Branchial vesicles oval. Pleopods 1 — 3, rami as long as peduncle. 

 üropods 1 and 2 not elongate, outer ramus without marginal spines. üropod 3 

 small, ramus slender, rather shorter than peduncle. Telson rather longer 

 than broad, proximally squared, then narrowing to entire apex with gi'oups 

 of spinules. L. about 12 mm. 



New Zealand. Among roots of grasses and in a small stream. 



2. P. hawaiexLSis (Dana) 1853 & 55 Orchestia h., J. D. Dana in: U. S. expl. 

 Exp., u 13n p.880; t. 59 f. 8 | 1862 O.k., Bäte, Cat. Amphip. Brit. Mus., p. 32 t. 5 

 f. 7 I 1893 0.?h., A. Della Vallein: F. Fl. Neapel, ?;. 20 p. 509 | 1899 O.k., Parorchestia 

 (part.), T. Stebbing in : Tr. Linn. Soc. London, ser. 2 u 7 p. 402. 



Side-plates rather large, 5**» almost as deep as 4*^ Pleon segments 1 — 3 

 with no hairs, setae, or notches ou the lateral margin. Eyes nearly round. 

 Antenna 1 reaching nearly end of ultimate Joint of peduncle of antenna 2, 

 3^ Joint as long as 1^* and 2^ combined, flagellum with 7 joints which are 

 füll 4 times as long as broad. Antenna 2 rather more than half as long as 

 body, peduncle rather long, flagellum longer than peduncle, with 17 or 18 joints, 

 which are more than twice as long as broad. Gnathopod 1 in 9, 6*^ Joint 

 oblong, but nari:ower at apex, and not properly truncate, finger a little longer 

 than the width of the Joint. Gnathopod 2 in 9 , 4*^ Joint gibbous and finely 

 scabrous below, 6*^ not much shorter than 5*^, with distal expansion not very 

 broad. the minute finger rather obliquely placed. Peraeopods 1 — 5 slender, 

 1^* and 2*^ comparatively long, 3^ not shorter than 2*^. üropod 1. outer ramus 

 with only apical spines, one very long. L. 16 — 18 mm. 



Tropical Pacific (Hawaiian Islands). 



3. P. sylvicola (Dana) 1852 Orchestia s., J.D.Dana in: P. Amer. Ac, v.2 

 p. 202 I 1853 & 55 0. s., J. D. Dana in : U. S. expl. Exp., v. 13 11 p. 873; t. 59 f. 2 ? , f. 

 3 d I 1862 0. s., Bäte, Cat. Amphip. Brit. Mus., p. 21 t. 3 f . 7 [ 1881 0. s., G. M. Thom- 

 son in: Tr. N. Zealand Inst., v. 13 p. 208 t. 7 f. 4 | 1886 0. s., G. M. Thomson & Chiltou 

 in: Tr. N. Zealand Inst., u 18 p.l45 | 1893 0. s., A. Della Valle in: F. Fl. Neapel, 

 ».20 p. 510 I 1899 0. s., Parorchestia (part.), T. Stebbing in: Tr. Linn. Soc. London, 

 ser. 2 u 7 p. 402. 



Body rather compressed. Side-plates not very large, 5*^ nearly as deep 

 as 4*^^. Pleon segment 3, postero-lateral corners quadrate. Eyes round, 

 rather small, dark, usually as far apart as their width. Antenna 1 reaching 

 end of penultimate Joint of peduncle of antenna 2, but sometimes much 

 farther, 3^ Joint longer or much longer than 2^ or 1^\ flagellum not shorter 



