OHCHKSTIDJi. 37. 



British Museum, and Libelled by him Ga tit mar us minug ; but it 

 must have got there by accident, as it in no way agrees with that 

 author's descrii^tion of that species. 



Hub. North America. In brooks, under stones (Say). 



4! Allorchestes carinatus, n. s. (Plate YI. fig. 2.) B.M. 



Eyes oval. Superior antenna; as long as the inferior ; the articula- 

 tions of the peduncle short, subcqvial, the basal one stoutest, and 

 not so long as the flagellum. The inferior antennae not so stout 

 as the superior ; the peduncle shorter than the flagellum. Fii'st 

 gnathopod having the dactylos slight, sharp, and longer than the 

 palm ; the propodos is nearly three times longer than its diameter ; 

 the palm is anteiiorly and inferiorlj- produced forwards ; the caipus 

 is as long as the propodos, slightly produced inferiorly and ante- 

 riorly. The second gnathopod moderately developed ; propodos 

 somewhat triangular, with the angles roimded ; the palm oblique, 

 and furnished \vith a solitary short, stout spine between the palm 

 and the inferior margin ; carpus short, the inferior edge broadly 

 developed. 



Length ^ths of an inch ? 



The specimen from which this description is taken is imperfect ; 

 it was labelled Dexamine carinata in the Collection of the British 

 Museum. I have retained the specific name of carinatus, under the 

 supposition that the lost part must have possessed a caiina. 



Hah. Italy. 



5. Allorchestes Novae-Zealandiae. (Plate VI. fig. 3.) B.M. 



Allorchestes Novi-Zealandiae, Dana, Proc. Amer. Acad. Sci. ii. 207, 

 female; U.S. Explor. Expcd. p. 894, pi. 61. f. 1, male and female. 

 Allorchestes intrepida, Dana, Proc. Amer. Acad. Sci. ii. 207, male. 



Male. — Eyes round and small. Superior antennae \vith the peduncle 

 as long as the flagellum. The iiedunclc of the inferior nearly as 

 long as the superior antennae, and longer than the flagellum ; the 

 whole organ is more than one-third of the length of the animtil. 

 Maxilliped having the dactylos slender, and as long as the pro- 

 podos, which is also attenuate ; the carjms is broad, and the three 

 succeeding articulations bear only a generic signification. The 

 first pair of gnathopoda have the dactylos more than twice as long 

 as the palm ; the propodos has the superior margin parallel with the 

 inferior, consequently the palm Is veiy short ; the car])us is sliorter 

 than the projjodos, and the carpal process is but moderately pro- 

 duced. The .second pair of giiathopuda larger than the first ; the 

 propodos is ovate, tapering anteriorly ; the palm is straight, and 



