OHCnESTlDiB. ',] 1 



23. Orchestia quadrimana. (Plate V. fig. 3.) 



Orchestia quacLrimaiia, Dana, Proc. Amer. Acad. Sci. Host. ii. 204 ; 

 U.S. Erplor. Expecl p. 879, pi. 59. f. 7. 



" Male. — Coxa; rather broad, fifth shorter than fourth. Inferior 

 antennae liartlly lialf as long as the body, neatly setose ; base 

 short, flagellum sparingly longer than base; joints not oblong, 

 cylindrical ; setse verticillate, and nearly twice longer than joints. 

 Superior antenna) nearly half shorter than base of inferior. Fii-st 

 pail' of gnathopoda minute ; propodos subtriangular, apex truncate 

 and a little excavate. Propodos of second pair stout, quadrate, a 

 little oblong ; apex nearly straight, truncate, the palm of the pro- 

 podos consequently transverse, or but slightly oblique, somewhat 

 excavate. First and second pairs of pereiopoda weak, subequal ; 

 third, fourth and fifth similar, very unequal, but gradually in- 

 creasing in length ; third half shorter than fifth ; setae; of propodos 

 numerous, rather crowded, and exceeding the diameter of the joint 

 in length. 



" Length seven Lines. 



" Hah. Illawarra, New South Wales." — Dana. 



24. Orchestia serrulata. (Plate V. fig. 4.) 



Orchestia serrulata, Dana, Proc. Amer. Acad. Set. Host. ii. 204; 

 U.S. Explor. Exped. p. 871, pi. 58. f. 7. 



" Male. — Coxae moderately broad, fifth anteriorly not narrower than 

 fourth. Inferior antennae about half as long as body, flagellum 

 as long as base ; joints not oblong, setae nearly obsolete. Superior 

 autennjE hardly longer than half the base of the inferior ; flagcllmu 

 seven- or eight-jointed. Propodos of fii'st pair of gnathopoda qiute 

 small, broader at apex, straight, truncate, and a little excavate. 

 Propodos of second pair largo, suboval ; palm infcro-subapical ; 

 this part of inferior margin excavate and minutely spinulose. 

 First and second pairs of pereio2)oda slender, subccjual ; the thi-ec 

 posterior gradually increase in length ; similar setae very minute 

 and few ; fii'st joint very broad, serrulate behind, and having two 

 or three minute setae on the front margin. 



" Female (?). — First pair of gnathopoda with a very small propodos, 

 short, linear in fonn, not broader at apex, which is truncate ; 

 carpus longer and sparingly broader, below nearly straight ; dac- 

 tylos terminal, slightly oblique though transverse, very short. 

 Flagellum of inferior antennae fourteen-jointed. 



" Length nine and a half lines. 



" Hah. From among sea-weed thrown up l)y the tides, on the 

 shores of islands called the Black Hocks, in tlu; Bay of Islands, New 

 Zealand . ' ' — Dana. 



