1907. 59 



CRUSTACEA ARTHROSTRACA. 



BY H. J. BUCHANAN-WOLLASTON AND DKNIS R. PACK-BERESFORD. 



The small extent of sandy shore makes the collection of 

 marine representatives of this group difficult. Consequently 

 the records of Amphipoda and marine Isopoda are but scanty. 

 On the other hand, the terrestrial Isopoda (" Woodlice ") have 

 been somewhat fully studied. 



AMPHIPODA. 



CAIYlIYlARIDvE. 

 Gammarus Iocusta (L.) — Coruiuou throughout littoral regiou. 



HYPKRIIDJE. 



Hypcrla galba (Mont.) — Numerous specimens were found on a 

 Rhizostoma cast up into a shore pool on the S.W. of the island, some 

 alive and some (in the stomach) in a partly digested condition. 



ATYLIDJE. 

 Tritaeta gib'oosa (Sp. Bate). — One specimen from a shore pool on 

 S.W. of island (from weeds growing in pool). 



ISOPODA. 



SPHJEROmiDJE. 

 Nsesa bldentata (Adams). — One specimen found in weed torn from 

 rock pool on S.W. of island. Several specimens (male and female) 

 from Talbot's Bay and near Carrickdorrish. 



IDOTHEID/E. 

 Idothea baltica (Pallas). — Common among weed in shore pools. 

 Young specimens common. 



LIGIID/E. 



Llgla occanlca (L.) — All round the shore. 



TRICHONISCIDiE. 

 Trichonlscus pusillus (Brandt.)— Common in damp places. 



ONISCIDJE. 



Oniscus asellus (Linn.).— Common from the highest point of the 

 island to the sea shore, and specimens of exceptional size. 



Philoscia muscorum (Scopoli). — Everywhere. 



Porcellio scatter (Latreille). — Common. 



Porcellio pictus (Brandt).— A handsome specimen in our host's 

 dining room ; also in and about the little guest house on the hill. 

 Only recorded in Ireland from Dublin, Belfast, Galway, and Carlow. 



ARMADILLID7E. 



Armadillidium vulgare (Latreille.)— Very common. 



