AMATHILLA SABINI. 363 



articuli broader than long ; the secondary appendage is 

 slender, and consists of from four to five oblong 

 articuli. The inferior antennae are slightly longer than 

 the superior ; the flagellum being twice as long as the 

 peduncle. The hands of the first two pairs of legs are 

 small, and of the same size and form; they are ovate, 

 and have the palms very oblique and imperfectly defined ; 

 and the fingers nearly as long as the hands. The walking 

 legs are nearly of the same length ; but the coxae of the 

 three posterior pairs are shorter than those preceding, 

 and the thighs are broadly developed. The caudal append- 

 ages terminate at an uniform extent, and are double- 

 branched, one branch in the first and second pairs being 

 rather more slender than the other, and those of the 

 posterior pair being broader and foliaceous, nearly of the 

 same length and size, and fringed with cilia. The 

 middle tail-scale is entire, flat, elongate-conic, and trun- 

 cate at its extremity. 



The colour of the animal is of a bluish-green, mottled 

 with red. 



This species is certainly the Gammarus to which Dr. 

 Johnston (without reference to Fabricius) gave the 

 specific name of G. carinatus. 



It was also referred by Mr. A. White to the Cancer 

 (Gammarus) carino-spinosus of Turton, but it is quite 

 evident that the latter never examined the animal of 

 unknown habitat in the British Museum, which he 

 cites, but that his knowledge was derived from the 

 Fabrician description of Atylus carinatus, the name of 

 which he unnecessarily altered. A rigid examination 

 of Arctic as well as British specimens of this species has 

 also satisfied us that the Amphithoe Moggridgei is identical 

 with A* Sabini. 



Rathke has described a species, as distinct from 



