Clare Island Survey — Land and Fresh-water Isopoda. 44 3 



ant, Zasius flavus) on the top of the low cliffs of the southern shore beyond 

 the Abbey; and it was also found in a similar situation (E. F. S.) on the 

 eastern shore of the island. The only other localities in Mayo where this 

 species has been obtained are Old Head, Louisburgh (A. W. S.), and on the 

 shore at Westport demesne (J. 1ST. H.). 



Philoscia muscorum (Scopoli). 



This species is common in the district, though not seen on any of the 

 islands in the eastern part of Clew Bay, except on Annagh Island. On Clare 

 Island it was obtained up to elevations of 900 feet. As a rule the specimens 

 were dark-coloured, but a few of the bright yellow variety were noted. 



Oniscus asellus Linn. 



As obtains elsewhere in Ireland, this species shares with Porcellio scaler 

 the distinction of constituting our commonest species of woodlouse. On Clare 

 Island it was not observed at an altitude higher than 1000 feet ; but in the lower 

 parts of the island and all through the mainland district it is present in great 

 numbers. Many of the specimens of this species measured 17 x 9 mm., and 

 all through the district the average size must be considered greater than 

 usually obtains in Ireland. The coloration in this species was generally 

 typical, but some tawny-coloured examples were found in the vicinity of 

 Westport. 



Porcellio scaber Latreille. 



Like the preceding the average size of this species was larger than obtains in 

 the north-eastern parts of Ireland, a very broad form being common both on the 

 island and throughout the district. Only the uniformly dark-coloured typical 

 examples were seen on Clare Island ; but the mainland yielded numerous 

 specimens lighter in colour — some of them tawny-coloured with brown 

 markings, or even uniformly of a brownish orange shade. This species, on 

 Clare Island, exists in countless numbers on the shore, and cannot be 

 regarded as uncommon in inland situations. P. scaber was the only woodlouse 

 found on Bills of Achill. 



Porcellio pictus Brandt. 



This species affects drier habitats than those usually tenanted by woodlice, 

 and was frequently observed inside houses — even invading the beds in 

 several of our stopping-places in the district. The specimens seen were all of 

 small size, none of them attaining 14 mm. in length, and the coloration was 

 not so vivid as generally obtains in this species. On the mainland it was 



