AMPHIPODA AM) ISOPODA OF THE FIRTH OF CLYDE. 91 



Karnes Bay, Cumbrae ; but none were found under 

 the stones on the higher ground outside of the 

 plantation. Mr. John Smith informs me that they 

 are common under stones, and between the wood 

 and the bark of fallen trees ; but they are much 

 more common under 30 feet above sea-level than 

 higher up. On the 26th of January last, immediately 

 after the snow had melted, I searched under the 

 stones in the same locality in Cumbrae where I had 

 found them so plentifully in summer and autumn, 

 but not one was to be seen. They must have deeper 

 quarters where they retire during the cold of winter. 

 Bate and West wood state that this species is very 

 common throughout England, Scotland, and Ireland, 

 under decaying vegetable and animal matter, not 

 only in damp but also in the driest localities.* 



Genus Porcellio, Latreille. 

 porcellio scaber, Latreille. 



Porcellio scaber, Latreille, Hist. Nat. Crust, et Ins., 

 vii., p. 45. 



Oniscus granulatus, Lamarck, Hist. Anim. sans 

 Vertebr., v., p. 261. 



Porcellio dilatatus, Brandt and Batzeb., Arzn. Thiere, 

 t, 12, f. 6. 



Oniscus asellus, Fabricius, Ent. Sys. Suppl., p. 300. 



Porcellio Brandtii, Milne Edwards, Crust., hi., 168 

 (var.). 



Porcellio dubius, Koch, in Cont. Panz. Heft. 180, 

 n. 8. 



Porcellio affinis, Koch, in Cont. Panz. Heft. 180, n. 

 13 (var.). 



Habitat. — Common round the shores of Cumbrae, 

 near and above high-water mark, under stones and 

 decaying sea-weed, a dozen or more often occurring 

 under a stone. Mr. John Smith has sent me speci- 

 mens from the sand-hills at Stevenston, and from 



* Brit. Sessile-eyed Crustacea, vol. ii., p. 46S. 



