ATYLUS GIBBOSUS. 249 



increase considerably towards the distal extremity, 

 mostly on the posterior margin of the legs, where they 

 are furnished with three or four strong spines, which 

 appear to be of sufficient length and strength to assist 

 the fingers in their prehensile acts ; the hands are not 

 longer than the wrists, and those of the posterior pair 

 are slightly bent or waved, the fingers being directed 

 posteriorly. The penultimate pair of caudal appendages 

 are much shorter than the other two. The terminal 

 caudal plate is long, tapering, and divided from the apex 

 nearly to the base. 



This species was first procured by the late Mr. Geo. 

 Barlee, from the Shetlands ; and it has since been taken 

 by the Rev. A. M. Norman and Mr. Jeffreys, in the Outer 

 Skerries Harbour, as well as in from seventy to ninety 

 fathoms of water, sixty miles east of the Shetlands. 

 Mr. Alder has also taken it on the coast of Northumber- 

 land. 



