170 GAM MA RULE. 



common in the order ; the fourth joints are dilated pos- 

 teriorly, and distally produced to a point these and the 

 two following joints are fringed with small hairs; the 

 fingers are straight and posteriorly directed. The seventh 

 or last pair of legs are very long, three or four times as 

 long as the others ; the coxa is quite as deep as that of 

 the preceding legs ; the second joint is about half as 

 long as the preceding legs, considerably dilated, and the 

 posterior margins fringed with hair; the third joint is 

 short, the three following are subequally long and nar- 

 row ; the finger is as long as the hand, short, straight, 

 styliform, and anteriorly directed. The posterior pair of 

 caudal appendages are not longer than the preceding, and 

 have the branches longer than the peduncle. The central 

 tail-piece is nearly as long as the peduncle of the last pair 

 of caudal appendages. 



We first took a mutilated specimen of this animal from 

 some trawl-refuse, in the neighbourhood of Plymouth ; 

 it was from this imperfect animal that the original de- 

 scription, in the Catalogue of the British Museum, was 

 made. The Rev. A. M. Norman has subsequently al- 

 lowed us to examine a specimen which he procured on 

 the coast of Northumberland. We have dedicated this 

 species to our valued correspondent, Mr. Stimpson, the 

 zoologist of the United States' Expedition to Japan, by 

 whom the genus was established upon animals procured 

 off the coast of the United States, and to whom we are 

 indebted for many named species of his crustaceous dis- 

 coveries. 



