Clare Island Survey — Marine Mollusca. 22 1 5 



Lacuna pallidula (Da Costa), var. patula Thorpe. W. M. Eare ? A few shells 



in 19 f. in the bay, and 1 in 10 f. off Light-house Cove; living at low 



water, Portlea, Clare Island. 

 L. divaricata Fabrieius. W. M. E. Swarming between tide-marks on the 



island and bay shores, especially on Viva latissima. Frequent in 



dredgings, 2-19 f. 

 Alvania carinata (Da Costa). (Bissoa striatula.) W. M. Eare : taken in 



4 dredgings in from 5 f., off the Castle, to 19 f., in mid-bay, a total of 



10 perfect and 9 broken shells. 

 A. cancellata Da Costa. (Bissoa.) M. Eare : one shell in 10 f. and 4 shells 



and 3 fragments in 19 f. 

 A. reticulata (Montagu). (Bissoa.) W. M. E. Common : taken in 



8 dredgings, 2-19 f. As many as 259 shells, several of them 3"5 mm, in 



length, were taken in one haul in 5f. off Inishlyre. 

 A. punctura (Montagu). (Bissoa.) W. M. E. Common : taken in 10 dredgings, 



2-19 f., and abundantly in many, e..g, 419 shells in 10 f. off Light-house 



Cove, 246 in 11 f., and 203 in 19 f. in mid-bay. 

 Manzonia zetlandica (Montagu). (Bissoa.) M. Eare : a single shell dredged 



in the bay in 19 f. 

 M. costata (Adams). (Bissoa.) W. M. E. Common : taken in 12 dredgings, 



2-19 f., and often in large numbers. A haul in 10 f. off Light-house 



Cove yielded 493 shells. 

 Zippora membranacea (Adams). (Bissoa.) M. E. Eare ? Taken in 2 



dredgings, 1 living specimen in 5 f., Inishlyre Eoads, and 6 shells in 19 f. 



in mid-bay. 

 Persephone violacea (Desmarest). (Bissoa.) W. E. Frequent: a total of 



33 shells was taken in 6 dredgings, 2-10 f. 

 Rissoa parva (Da Costa). W. M. E. Common : living between tide-marks 



all round the shores of the bay ; shells in greater or less quantity 



in almost all dredgings, 2-19 f. The numerical proportions of the type 



and of var. interrupta varied greatly in different dredgings, although in 



the littoral zone of the island the variety was markedly predominant, 



occurring in swarms round the roots of Gystoseira ericoides. A 5 f . haul 



off Granuaile's Castle in 1909 gave 1,015 of the variety to 500 of the 



type, while a haul off Mulranny in from 5| to 11 f. gave 46 of the variety 



to 177 of the type. Many living specimens dredged in 5 f. off the Castle 



were thickly encrusted with a coralline growth, probably a species of 



Melobesia. 

 R. inconspicua Alder. W. M. E. Frequent, taken in 7 hauls, 2-19 f., a total 



of 55 specimens, many living in 5 f. off Inishlyre, 



