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 
