t9U- CoLGAN. — Op islhoh ranch Faiind of Co. Dubli)i. 167 
T. truncatula (Biugnierc). 
Utriculus iruncaiulus. 
Shells occasional in drift and locally abundant in drcdgir.gs, 
as many as 210 having been taken in a single haul in 16 f. 
off the Muglins in 1908. Only once taken in a living state, 
a single specimen in 10 f. off Bullock in 1912 : N.C. Largest, 
4 mm. long. 
Cylichnina umbilicata (Montagu). 
Cylichna umbilicata. 
Rare, Dublin Bay : Turton, '16. Twice dredged of? 
Dalkey and Skerries, 4 shells, in 12-13 f., 1906-09 ; one 
shell in drift, N. Bull, 1907 : N.C. Largest, 4 mm. long. 
Volvulella acuminata (Bruguierc). 
Cylichna aciiminaia. 
Very rare and not found recently. Portmarnock, very 
scarce : Hart, '92. 
Scaphander lignarius (Linne). 
Common, living on oozy bottoms all along the coast in 
from 4 to 14 f. ; often cast up living during easterly gales 
at N. Bull, S. Bull and Portmarnock, where shells are 
abundant. Largest, 63-5 mm. long. 
Bulinella cylindracea (Pennant). 
Cylichna cylindracea. 
Shells not infrequent in dredgings up to 17 f. and in drift 
at Rush, Portmarnock, N. Bull, and S. Bull, 1905-09 : 
N.C. Largest, 14-5 mm. long. 
Diaphana hyalina (Turton). 
U trie ulus hyalinus. 
Rare in drift and in dredgings. At Portmarnock (Mr. 
Warren), Thompson, '44. Dalkey Sound (Dublin Museum), 
Nichols, 1900. Two shells in drift, Lambay Harbour, 
Colgan, '07. One shell in 16 f. off Muglins, 1908, and 3 in 
drift, N. Bull, 1906-08 : N.C. Largest, 3-5 mm. long. 
