ATYLUS BISPTNOSUS. 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 tw r o. 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 w T ith 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. Gr. 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 

 Northumberland. 



