22 28 Proceedings of the Royal Irish Academy. 



Pecteu tigerinus Miiller. M. Eare : dredged 4 times, 10-20 1, 1 living 

 specimen (18 f.) and 6 valves, the largest 24 nun. x 22 - 5 mm. 

 Tar. eostata Jeffreys. A single valve dredged in the bay. 

 Lima Loscombi G. B. Sowerby. M. Very rare : a single fresh valve 7"5 mm. 

 x 5 mm. was dredged in 10 f. about \\ mile X.E. of Old Head, August, 

 1910. 



Order EELAMELLIBEAXCHLVTA. 



Astarte sulcata (Da Costa). M. Eare : only 2 valves taken, one in 16 f. and , 

 the other in 20 f. This is quite a rare species in the shallow waters 

 of "West Ireland, though off the Dublin coast it is frequent, living, even 

 at a depth of no more than 8 f. 



A triangularis (Montagu >. TV. M. E. Common off the island in 5 f. and 

 in 10 f. ; frequent in the bay, and rare amongst the inner islands, 

 where it was taken, sparingly, in only one dredging off Inishlyre. A 

 total of 252 paired valves, many with the living animal, was taken in 



9 dredgings in from 5-19 f., the largest specimen 2 - 5 mm. Living at 5 f , 



10 f., 15 f., and 1 9 f. A single haul in 5 f. off Granuaile's Castle yielded 

 181 paired and 60 single valves. 



Arctica islandica Linne). {Cyprina. ) M. Xot infrequent. Taken in 6 hauls 

 in the bay, 10-25 f., a total of 13 valves and 1 pair of juvenile valves. 

 Large valves 102 mm. in breadth were taken in 10 f. and 16 f. in mid-bay. 

 Shells of this species are so rarely cast up on our western shores, and 

 records of their occurrence there in shallow waters are so few, that the 

 species has come to be regarded as quite rare on the Irish west coast. 

 Further research wiU. probably show that it is really frequent on the 

 west, though nowhere so common there as on our east coast or inhabiting 

 such shallow water. 



Lucina spiuifera (Montagu). M. Eare : one smaU valve in 13 f. and another 

 in20f. 



L. borealis (Linne i. TV. M. E. Common, both living and dead, on the sandy 

 eastern shores of the bay and in dredgings, 2-25 f., the dredged specimens 

 being usually juvenile. Valves gathered on the beach at Belelare were 

 41*5 mm. in breadth. 



Axinus flexuosus (Montagu). M. E. frequent and locally abundant: taken 

 in 10 hauls, 2-19 f.. the largest valve measuring 12 mm. x 11 mm. A 

 living specimen was taken in 10 f. in the bay. 



Diplodonta rotundata < Montagu). M. frequent and locally abundant in the 

 bay. Taken in 8 hauls, 10-19 f.. a total of 97 valves, one 24 mm. and 

 several 23 mm. in breadth. A haul in 19 f. gave 57 valves, another 

 in 16 f., 33 valves ; Lui no living specimen was taken, though many of 

 the valves were quite fresh and several juvenile. 



