236 The Irish Naturalist, Noveuiber, 



OX TIIR IGNKOUvS ROCKvS AND ASvSOCIATKD SEDIMKNTARIEvS 

 OJ'^ THK TOURMAKEADY DKSTRICT, CO. MAYO. 



liV C. J. GARDINER, M A., K.G.S. AND I'ROF. .S. H. RKYNOIvDS, 



M.A., FG.S. 



The district described lies along the western shores of Lougli Mask, 

 and has a length of about 4] miles with an average width of about a mile. 

 The oldest rocks are a series of grits, tuffs, conglomerates, red and black 

 cherts, and graptolitic slate met with chiefly in the south-eastern part of 

 the area. Graptolites have been found in the slate at three localities, a 

 large series having been obtained in the stream near Mount Partry. 

 These were examined by Miss G. L. Elles, and are of Upper Arenig age. 

 Succeeding these Arenig rocks is a series of grits and grittj' tuffs, asso- 

 ciated with a remarkable development of limestone breccias. A large 

 collection of fossils has been made from these rocks and examined by 

 Mr. F. R. Cowper Reed. The general character of the fauna, and 

 especially the presence of the genus Pliomera (Amphion) indicates that 

 these rocks are of Llandeilo age. 



A great series of acid igneous rocks (felsites and rhyolites) plays a 

 prominent part, and probably includes both intrusion and contempor- 

 aneous members Small intrusions of various types of intermediate and 

 basic rocks also occur. 



SECTION D.—ZOOL OG Y. 

 THE RESPIRATION OF I^AND LSOPODS. 



BY E. I.. UNWIN. 



Wood lice are derived from aquatic ancestors and the different species 

 are suited to different degrees of dryness. Trichoniscus pusillus soon dies, 

 unless kept very damp, while Porcellio scaler can live four or five days in 

 a dry box. Ligia oceanica^ Trichoniscus pusillus, Oniscus aselltis, Porcellio 

 scaler, and Arviadillidium viilgare foim a series showing transition from 

 damp to dry conditions of life, and a corresponding gradation from 

 simple gills to gills supplemented by air-tubes branching through some 

 of the abdominal exopodites. 



THE MIGRATORY MOVEMENTS OF CERTAIN SHORE-BIRDS 

 AS OBSERVED ON THE DUBLIN COAST. 



BY PROF. C. J. PATTEN, SC.D. 



The majority of the author's observations, extending over twenty 

 years, on the migratory movements of shore-birds on the Dublin coast 

 have been incorporated in his work entitled *' The Aquatic Birds of 

 Great Britain and Ireland," published at the end of the year 1906; but he 

 has still continued to visit the scenes of his ornier hunting-grounds, 

 and, with the aid of trustworthy correspondents, he has collected further 

 information. Among the birds dealt with he referred particularly to the 



