BRITISH STALK-EYED CRUSTACEA. 389 



globular, and the size of the mature animal less than that of the 

 the former species. 



The very remarkable means by which this species may be 

 identified when taken, and to which we alluded above, is one 

 mentioned prominently by Bell as having been noted by Mr. 

 Thompson — namely, that the shell in which this species lives is 

 generally also the "locus" of an Actinia, Adamsia palliata. It 

 appears, however, that Dr. Leach and Prof. E. Forbes do not 

 seem to have been able to endorse this experience, although of 

 the many hundreds of specimens that we have examined, from 

 our southern waters only, it certainly was a remarkably constant 

 rule. Another somewhat curious fact is that the shell in which 

 this species lives is only large enough to protect the lower 

 portion of the abdomen, and this shell is almost invariably 

 Trochus magus. 



The colour of P. Prideauxii is a pale reddish brown, with 

 blue bars upon the legs. 



The ova are of a rich burnt-sienna tint, and more globular 

 than those of P. Bernhardus. 



This species has been recorded from Loch Fyne, Strangford 

 and Belfast Loughs, off Dundrum, and from Plymouth Sound. 

 We have obtained it by dredging from near Guernsey and from 

 the English Channel off the Sussex, Dorset, and Devon coasts. 



Pagurus tricarinatus, Norman. 



This species was described by Dr. Norman in the British 

 Association Report, 1868, from three specimens obtained from 

 deep water off Shetland. We have not seen it. 



Pagurus cuanensis, Thompson. 



This species, discovered by Mr. W. Thompson off the Irish 

 coast, may be recognised by its having the anterior pair of legs 

 shorter, more massive and hairy than the two first species of this 

 genus. The eye-stalks are very long in comparison with those of 

 P. Bernhardus or P. Prideauxii. It chiefly selects the shells of 

 Murex erinaceus for its habitation, but is occasionally found in 

 those of other molluscs. 



This is by no means a widely distributed species, but has 

 been recorded from Portaferry, Bangor Bay, Belfast Bay, Shet- 

 land (rare), Dublin (rare), Plymouth, Northumberland and Durham 



