Clare Island Survey — Marine Mollusca. 22 13 



Donnish were fully 25 mm. in length and breadth. Quite absent from 

 the shores of the inner islands and from the muddy creeks and channels, 

 the species apparently thriving only in pure open-sea water ; yet no trace 

 of it could be found on the shores of Clare Island, though carefully 

 searched for. ' 



Gibbula magus (Linne). (Trochus.) W. E. Abundant, living, and of large 

 size, in the channels amongst the eastern islands in from 2-5 f. on 

 muddy or " coral " bottoms. Especially fine in Inishlyre Eoads, where 

 examples up to 30 mm. in diameter were frequently dredged. Very rare 

 in the deeper and purer waters of the open bay, where it was but once 

 taken, a single shell in 10 f. 



G. cineraria (Linne). (Trochus.) W. M. E. Common between tide-marks ; 

 frequent in dredgings, 2-12 f., but of small size in depths greater than 



5 f. 



G. tumida (Montagu). {Trochus.) W. M. E. Frequent. In 5 dredgings, 

 4-19 f. ; rare in the shallower water, but abundant in the 19 f. haul. 



G. umbilicata (Montagu). {Trochus.) W. E. Very common between tide- 

 marks ; absent from all dredgings. 



Circulus striatus (Philippi). (Trochus Duminyi.) W. M. Eare. Twice 

 dredged in 1910, 3 shells in 10 f. off Light-house Cove, July 26th, and 1 

 shell in 19 f. in mid-bay, August 17th. The largest of the 4 perfect 

 shells taken measured almost 3"5 mm. in diameter. Clew Bay is but the 

 fifth Irish station on record for this rare species. 



Calliostoma Montagui (W. Wood). (Trochus Montacuti.) M. Eare : twice 

 dredged, once in 15 f. and again in 19 f., a total of 8 shells. 



C. miliare (Brocchi). (Trochus millegranus.) M. Eare : one juvenile shell 

 taken in 10 f., and 2 others in 19 f. 



C. zizyphinum (Linne). (Trochus.) W. M. E. Frequent, living, between tide- 

 marks : occasional in dredgings, 10-19 f. 



Phasianella pullus (Linne). W. M. E. Frequent in dredgings, 2-19 f- 

 Living at low water, Clare Island, and in 5 f. off the Castle. A more 

 brilliantly coloured shell there than on the Dublin coast. 



Scalaria clathratula (G. Adams). W. M. Eare : 2 shells dredged in 10f., and 



6 in 19 f. 



S. Trevelyana Leach. M. Eare : a single shell taken in each of two 



dredgings, 1 in 16 f., the other in 19 f. 

 S. communis Lamarck. W. M. E. Frequent, living, at low tide amongst 



the inner islands, as at Annagh Island, Inishiinmel, &c. ; whole or broken 



shells in small numbers in dredgings off the island and in the bay in 



5-19 f. 



