oRcnEsTiD^. 47 



triangulate anteriorly and nearly acute. Three posterior pairs of 

 l)ereiopoda subequal, increasing gradually in length ; setoe few ; 

 one stout, one as long as diameter of joint on propodos of third 

 pail", and one or two such on same joint of last two pairs. 

 " Length five to six lines. 



" Ilah. llio Janeiro, di'edged in the harbour; also Cape Verdes, 

 Porto Prava." — Dana. 



22. Allorchestes Pugettensis. (Plate VII. fig. 10.) 



Allorcbestes Pugettensis, !>«««, U.S. Explor. Expcd. p. 901, pi. 61. f.6. 

 Stimpsox, Journ. Nat. Hist. Bost. vol, vi. 



" Coxae moderately large. Superior antennaj half shorter than in- 

 ferior, slightly longer than base of inferior, and much more slender ; 

 flagellum fifteen-jointed, seta) nearly obsolete. Inferior antenna; 

 not as long as half the body, flagellum slightly longer than base, 

 joints a little oblong, seta3 very minute. Propodos of first pair of 

 gnathopoda ovate, arcuate above and below ; palm very oblique, 

 and not excavate. Propodos of second pair veiy stout, subovate, 

 tnmcate below, so that the palm is straight, or nearly so, and 

 sHghtly excavate ; dactylos long, and reaching to the angle ter- 

 minating the palm ; car[)us not produced below between proi)odos 

 and foui-th joint ; fourth joint triangular and subacute anteriorly. 

 Fourth and fifth pairs of pereiopoda subequal ; setae few and very 

 short. 



" Length of body nine or ten lines. 



" Hah. Puget's Round, North-west America." — Dana. 



23. Allorchestes Hawaiensis. (Plate VIII. fig. 1.) 

 Allorchestes Hawaiensis, Dana, U.S. Explor. Exited, p. 900, pi. Gl. f. 5. 



"Coxa; of moderate size. Ajitennce of superior pair much more 

 slender than those of second, nearly one-fourth the length of 

 the body ; flagellum foui-teen -jointed, joints long and slender ; seta? 

 about as long as breadth of joints. Inferior pair with the base 

 twice as long as base of superior ; joints of flagellum oblong ; seta) 

 few, and half as long as breadth of joints. Propodos of first pair 

 of gnathopoda verj' small, broad, subovate, above nearly straiglit, 

 below arcuate; palm oblique and nearly longitudinal; cai-pus 

 rounded below. Propodos of second pair of gnathopoda stout, 

 ovate, arcuate above and below ; palm very ol)lique, so as to be 

 nearly longitudinal, sparingly setulose ; carpus not produced l)elow 

 between propodos and fourth joint. Two posterior pairs of 



