480 Proceedings of the Royal Irish Academy. 



Ireland," vol. iv., is 350. The total number of species in this list is 

 546, 67 of which belong entirely to the deep-water district. The 

 number of species of marine Mollusca that have been taken in less 

 than 100 fathoms depth on the British coasts is 605 ; the number in 

 this list is 479, or rather more than 79 per cent. If we exclude the 

 Ascoglossa and ISTudibranchiata which have only been collected at a 

 few places on the Irish coast, this list contains 417 species out of a 

 total of 488 British species, or nearly 86 per cent. 



The only shallow-water species peculiar to the Irish Fauna are two 

 l^udibranchs, viz. Lamellidoris ididiana, found by Mr. W. Thompson 

 on oysters from the coast of Down or Antrim, and ^olis smguinea, 

 found in Eoundstone Bay by Canon Norman. 



The following species taken in the Irish shallow water district do 

 not appear to have been yet recorded from other British coasts, viz. : 

 Circulus strtakis, Homalogyra poly&ona, Somalogyra Fischeriana, Retro- 

 tortina fuscata, Cassidaria rugosa, Brachystomia subollonga^ Pyrgulina 

 clathrata, Turlonilla delicata, Neptunea despecta, Diaphana quadrata, 

 Dexiolranchmi paucidens, Lamellidoris nmricata, Lamellidoris Loveni, 

 Dentalitmi panormitanum, Lentaliimi agile, N-ucula corhdoides, Nucu- 

 lana pimlla, Ostrea cochlear, Becipula ovata, Lepton ohliquatum, Lyon- 

 siella abyssicola, and Lyonsiella inscidpta. Ten of these species are 

 southern, three are northern, one is pelagic, and the remaining eight 

 belong rather to the deep water district. 



List of the more important "Works and Papers referring to the 

 Irish Marine Mollusca: — 



Adams, B. W. : 



'60. Note on Corlula rosea. Ann. & Mag. Nat. Hist., (3) vi., 

 p. 455. 



'78. British Association Guide to the county of Dublin. Part ii. 

 Mollusca, pp. 54-70. 



Alcoce:, T. : 



'65. Notes on Natural History Specimens lately received from 

 Connemara. Proc. Lit. and Phil. Soc, Manchester, iv., 

 pp. 192-208. Mollusca, pp. 200-208. 



Aldee, J. : 



'44. Description of some new British species of Eissoa and 

 Odostomia. Ann. & Mag. Nat. Hist., xiii., pp. 323- 

 828. 



