LAND ISOPODA FROM BUTE. 127 



Holland, Germany, France, Switzerland, and Italy, 

 for the sake of comparison with British forms." 



L VXD ISOPOD A. 



Porcellio ARM YDILLOIDES, Lereboullet. — This is a 

 well-marked and easily distinguished species of 

 "sclater"; and one characteristic- by which it may 

 readily be identified, even by the uninitiated, is its 

 habit of rolling itself into a perfect ball when 

 alarmed. It need not be mistaken for Armadillo 

 vulgaris, which it somewhat resembles in this habit 

 of rolling itself together, for, if the tail appendages 

 be examined, they will be found to differ very much 

 from those of the Armadillo. 



In Bate and West wood's History of the British 

 Sessile-eyed Crustacea, the only reference to the 

 occurrence of this species in Britain is in these 

 words : " Specimens taken near London (at High- 

 gate ?) by Mr. Francis Walker are in the cabinet of 

 the British Museum." It would therefore appear to 

 have been at that time considered rare in Britain. 



It seems to be comparatively common in the 

 vicinity of the Royal Aquarium at Rothesay ; and 

 in looking over my collection I observe that an 

 Isopod found near Dairy, Ayrshire, in June, 1885, is 

 undoubtedly of this species. Its distribution in the 

 West of Scotland may therefore be regarded as 

 fairly wide. 



Philougria riparia, Koch.— This species has also 

 occurred in the vicinity of the Aquarium. I have, 

 as yet, only secured three specimens, and it may 

 therefore prove to be scarce ; but its small size and 

 inconspicuous appearance may be a reason for its 

 having been less frequently recorded than it might 

 have been if carefully looked for. Although no 

 Scotch locality is given by Bate and Westwood, 

 a number of places, both in England and Ireland, 

 are mentioned where it occurs. It should be looked 

 for in damp rather than dry situations. 



