302 The Irish Naturalist. September, 



ISOPODA. 



BY NEVIN II. FOSTER, M.B.O.U. 



I >r the 17 species of Terrestrial Isopods or Woodlice which 

 have been recorded as found in Ireland, S species were noted 

 during the Conference week. A list is appended showing 

 the localities and divisions of Cork County in which the}' 

 were obtained. The County divisions are those defined by 

 Mr. R. 14. Praeger ("Irish Topographical Botany." 1901), 



I have to thank Messrs. Browne, Milne, W. H. Patterson, 

 Robert Patterson, Welch and Praeger for handing me speci- 

 mens of this group collected by them : R. Welch for valuable 

 field notes; and also Dr. ScharfF, who kindly examined all the 

 specimens obtained and confirmed the identification, 



Ligfa occanica (Linne). — By the shore of the River Blackwater near 



Youghal, Cork East. Specimens observed were all of small size, the 



largest only measuring 22 mm. in length. It was by no means 



plentiful, and in some likely-looking habitats it was not seen at all. 



Trichoniscus pusillus (Brandt).— Near Cork City, Cork Mid; 



Youghal, Cork East ; Lough Allua, Cork West. Common under 



damp leaves or moss in woods and under stones in marshy ground- 



Oniscus asellus (Linne). — Near Kinsale, Cork Mid; Youghal and 



Rostellan, Cork East ; Inchigeela, Cork West. Abundant everywhere. 



Much more varied in colour than in the North or West ; many 



specimens noted of a light and some of a bright red colour, while at 



Kinsale several were bright yellow. 



Philoscla muscorum (Scopoli). — Kinsale, Cork Mid ; Youghal, Cork 



East; Inchigeela, Cork West. Though this species varies very much 



in colour in Cork, the specimens as a rule are brighter here than in 



the north ; some from the glen at Kinsale were almost scarlet. 



Platyarthrus Hoffman nseggii (Brandt). — In ant's nest near Cork 



City, Cork Mid. This spedes had previously been recorded in 



Ireland from Cork West, Waterford, Carlo w, and Dublin ; while in 



England its range appears to be restricted to the southern counties, 



and in Scotland it has only been discovered in two localities. 



PorceINo scaber (Latreille). — Youghal, Cork East ; Inchigeela and 



Old Head of Kinsale, Cork West. 

 IVIetoponorthus cingendus (Kinahan).— Youghal and Rostellan, 



Cork East; Inchigeela, Cork West. 

 Armadillidium vulgare (Latreille).— Youghal and Rostellan, Cork 

 East ; Old Head of Kinsale, Cork West. 

 The marine Isopod Spharoma serraium (Fabr.) was taken near Youghal, 

 Cork East. This species is frequently found in brackish pools. 



