17() PAGURID.E. 



the lateral portions of the carapace are more exclusively 

 membranous ; the hands, instead of being strongly tuber- 

 culated, are merely granulated, and the wrists, on which, 

 in P. Bernlmrdus, the tubercles become spinous on the 

 inner margin, are in this species furnished with small 

 tubercles ; the hand and wrist are elevated along the 

 median line of the upper surface. The ambulatory legs 

 are nearly smooth, and the terminal joint is grooved longi- 

 tudinally on each side, and is not twisted. The eye-stalks 

 are short and very thick, and the extremity, where the 

 eye itself is inserted, is globular. The spiniform palp of 

 the external antennae is more slender and less curved than 

 in P. Bernhardus. It is usually of considerably smaller 

 size, seldom exceeding two inches and a half from the front 

 to the extremity of the abdomen. 



The colour is light reddish-brown. 



The discovery of this species is due to Leach, who re- 

 ceived it from his indefatigable friend Prideaux, by whom 

 it was taken in considerable numbers in Plymouth Sound. 

 Tt has since that been found on several other parts of 

 the coast. In Loch Fyne it has been taken by my friends 

 Professor E. Forbes and Mr. M c Andrew ; and it has 

 also been taken in Ireland by Mr. W. Thompson and 

 Mr. Hyndman, "when dredging in Strangford and Bel- 

 fast Loughs, and in the open sea off Dundrum, county 

 Down." Mr. Thompson notices the very remarkable cir- 

 cumstance of its being found " in every instance in- 

 habiting the shell invested by the Adamsia maculata (Ac- 

 tinia m. Adams)." And Mr. Thompson proceeds to state, 

 " among the very numerous specimens of Paguri in my 

 collection, from all quarters of the Irish coast, and found 

 inhabiting shells of various species, not a P. Prideauasii oc- 

 curs except in connexion with the Acfuii" nlreudy named. v 



