536 Orchestia 



of it. Gnathopod 2 in d, 6**^ Joint massive, widening to the palm, which 

 is spinulose, slightly oblique, in shape variable, sometimes deepl}' excavate 

 near finger-hinge, then running with straight slope to an acute detiniug 

 tooth, sometimes more gently sinuous between hinge and tooth (in Dana's 

 figure endiug in a broad excavation with untoothed defining angle); fingerlong 

 to match the palm, its point passing the tooth. Gnathopod 1 in o , 6**^ 

 Joint shorter than o^^, spinöse, slightly narrower at apex than base, but 

 still affording a small palm to the overlapping finger. Gnathopod 2 in Q , 

 2^ Joint evenly and nowhere widely expanded, '^^ rather long, 5**^ not much 

 louger than G*^ 6*^ roundly produced a little way beyond the finger. 

 Peraeopods 3 and 4, 2^ Joint oval. Peraeopod 5, 2^^ Joint notably serrulate 

 on bind margin, which, instead of being rounded below as in peraeopods 3 

 and 4, is squared or angularly produced. In peraeopods 4 and 5, the 4^^ 

 and 5*^ joints are moderately stout, somewhat angular in section. üropods 

 1 — 3, all the rami with marginal spines, in uropod 1 rami shorter than 

 peduncle, in uropods 2 and 3 subequal to it. Telson with the usual little 

 apical notch, and a few spinules. L. ö sometimes exceeding 25 mm. 

 9 very much smaller. 



South-Pacific (New Zealand). Among sea-weed and iinder stones between tide-marks. 



9. O. guernei Chevreux 1889 0. 5»., Talorchestia?, Cheweux in: Bull. Soc. zool. 

 France, r. 14 p. 332 f. 



O unknown. — ö. Body tumid, all segments dorsally elevated, 

 peraeon segments 6 and 7 and pleon segment 1 each with 2 transverse 

 dorsal ridges. Side-plates not very deep. Pleon segment 3, postero-lateral 

 Corners simply quadrate (in figure). Eyes ovate. Antenna 1 reaching end 

 of penultimate Joint of peduncle of antenna 2. Antenna 2 half as long 

 as body, ultimate Joint of peduncle much longer than penultimate, flagellum 

 18-jointed. Gnathopod 1 rather robust, 5*^ and 6*^ joints strongly produced 

 apically. Gnathopod 2, 6*^ Joint large, very broad, palm much longer than 

 the very shoii; bind margin, finger robust, strongly curved, matchiug the 

 long palm. Peraeopod 4 very strong, 4*^ and 5*^ joints much longer tlian 

 broad. Peraeopod 5 not known. üropods 1 — 3 and telson nearly as in 

 0. gammarellus (p. 532). L. 9 mm. 



Bay of Horta [Azores (Fayal)]. In the sand. 



10. O. marmorata (Hasw.) 1880 Talorchestia? m., Haswell in: P. Linn. Soc. 

 K S.Wales, i'.5 p.99 t.5 f. 3 | 1893 T. m., Orchestia chilensis (Tpart)'^, A. DellaValle in: 

 F. Fl. Neapel, v. 20 p. 512. 



9 unknown. — ö. Side-plates with spinuliferous lower margin, 

 j^st yeiy gniall, sometines quite concealed by 2*^. Eyes irregularly oval, wider 

 than diameter apart, dark in spirit. Antenna 1 slender, flagellum 5-jointed. 

 Antenna 2 more than thrice as long as antenna 1, about ^/g as long as body, 

 peduncle stout, flagellum as long as peduncle, flattened, with 17 joints, which are 

 Short and most of them broad. Gnathopod 1. 5**» Joint subequal to 6*^^, distally 

 produced into a narrow, rounded process, 6*^ much widened distally, palm 

 transverse, finger well developed, overlapping the true palm but not the 

 broad pellucid process of bind margin of 6^*^ Joint. Gnathopod 2, 6*^ Joint 

 large, oval, palm oblique, defined by a minute acute tooth. Peraeopods very 

 thick, spinöse, finger of peraeopod 2 with irregulär inner margin, 2*^^ Joint 

 of peraeopod 5 not dilated behind except at the top. üropod 3 small. 



