ATYLUS BISPTNOSTJS. 
251 
The eyes are of a broad oval form, being white round 
the margins and black in the centre. The antennae are 
long and slender : the superior pair are about half the 
length of the animal, but the peduncle is scarcely longer 
than the head : the inferior pair are about one-third 
longer than the superior ; the peduncle is also longer 
than that of the superior. The first and second pairs of 
legs are of the same size and form, the hands being 
dilated scarcely beyond the diameter of the legs ; the 
palms of the hands are oblique, and fringed with nu- 
merous hairs of unequal lengths ; the fingers are fur- 
nished, on the inner margin near the apex, with a small 
tooth, larger in proportion than that represented in the 
figure at h , and one or two small hairs. The other legs 
exhibit nothing worthy of remark. The caudal ap- 
pendages are all double-branched, the branches being of 
uniform length and styliform, those of the last pair ex- 
tend considerably beyond the other two. The central 
caudal plate is ovate, with a slit down the middle ; it 
generally lies closely pressed against the animal. 
The surface of the skin, when examined with the 
microscope, is seen to be covered with numerous half- 
round small scale-like processes or plates, and a few short 
hairs, as represented in our figure. 
When first taken, the colour of the animal is of a 
greenish grey, mottled with black and yellow spots, par- 
ticularly in the line corresponding with the alimentary 
canal, and also upon the dorsal surface of the tail. 
We have dredged this species on the sandy bottom in 
Whitsand Bay, not far from the Rame Head ; and have 
received it from the Moray Frith, through the kindness 
of the Rev. G. Gordon and Mr. Gregor ; also from Fal- 
mouth and Tenby, where it was dredged by Mr. Web- 
ster: and Mr. Alder has found it on the coast of 
N orthumberlan d . 
