22 20 Proceedings of the Royal Irish Academy. 



Order OPISTHOBBAXCHIATA. 



Sub-Order Tectebraxchiata. 



Actaeon tornatilis Linne). TV. M. Eather rare : in -4 dredgings, 6-19 f.. 



10 shells, chiefly juveniles. 

 Tomatina obtusa Montagu). [Utriculus.) M. E. Eather rare: dredged 



4 times, 2-19 1, 32 shells, of which 4 belonged to Yar. lajonkaireana 



Basterot. 

 T. mammilla ta (Philippi). (Utricuhis.) TV. M. Frequent: dredged 4 times, 



5-19 f., a total of S4 shells, of which 55 were taken in a 19 f. haul. 



Living in 5 f. off Granuaile's Castle. 

 T. truncatula Bruguiere). ' Utriculus.) TV. M. E. Common : in 8 dredg- 

 ings, 2-19 f., 377 shells, of which 261 were taken in one haul in 10 f. 



off Light-house Cove. 

 Cylichnina umbilicata (Montagu). i Cylichna.) TV. M. E. Common : dredged 



12 times, 2-19 f., also taken in shore-gatherings at Doriuish, a total of 



216 shells, of which SO were taken in a 19 f. haul in mid-bay, and 48 in a 



10 f. haul off Light-house Cove. One example of the Yar. convlus Jeffreys 



was taken in 11 f. 

 C. nitidula (Loven ). [Cylichna.) M Bare : 3 shells taken in tow-net 



on dredge in 14 f., 2 miles X. E. of Old Head. Xew to the shallow- water 



region of Marine Province Y., the only other record being one from 



183 fathoms. 

 Volvulella acuminata (Bruguiere). {Cylichna.) M. Eare: taken in 4 hauls 



in the bay, 10-19 f., a total of 12 shells and a fragment. Three of 



the shells measured 3 mm. in length, two 3-5 mm., and one nearly 4 mm. 



In Irish waters this rare shell appears to occur usually in but small 



numbers. 

 Scaphander lignarius Linne . M. Eare ? only once taken, a single shell 



in 19 f. 

 Bulinella eylindracea Pennant. (C'ylicJiua. TV. M. Frequent: dredged 



9 times. 5-19 f.. 42 shells in all, the largest 12 - 5 mm. long. 

 Diaphana hyalina (Turton). {Utriculus. TV. M. E. Eather rare : taken in 



5 dredgings, 4-11 f., 16 shells in all. 

 Bulla utriculus Broechi. M. Eare : only once taken, 4 shells in 19 f. 

 B. hydatis Linne. E. TVestport, Clew Bay, one specimen (Thompson MS.) : 



Nichols, 1900. 

 Acera bullata Miiller. E. Eare : One large living specimen dredged in 5 f . 



off Inishlyre, July, 190u. In 3 fathoms, Clew Bay : Forbes, '53. 



