612 Proeeedings of the Royal Irish Aaidemy. 



Modiolaria marmorata (Forbes). 

 i., ii., iii., iv., v,, vi. 



Common, imbedded in the tests of Ascidians. 



Bistrihution. — Norway to Mediterranean. Mogador. Canaries. 

 St. Helena (Smith). Persian Gulf. ?N. E. America. K Pacific. 



Modiolaria costulata (Risso). 

 . . . iv., . vi. 



iv. E,. I. A. Exp., [1885, Berehaven, between tides], a few valves 



(Chaster, '98). 

 vi. Carrahubbuck, Killala Bay, rather abundant (Miss A.Warren,'92) : 



Bundoran, co. Donegal (Waller, f. Jeffreys, '63). 



Bistrihution, — British Isles to Mediterranean. Canaries. 



Modiolaria discors (Linne). 



i., ii., iii., iv., v., vi. 



i. Off Ballycastle, living (Chaster, '97a) : Larne Lough, not 

 uncommon (Thompson, '56) : off Black Head, 25 fms. 

 (Hyndman, '59) : Belfast Lough, 10-25 fms., living, rare, 

 and Turbot Bank, dead (Hyndman, '58) : Crawfordsburn 

 (Stewart, f. Praeger, '89): Groomsport (Praeger, '92a): 

 Donaghadee, 8-10 fms. (Drummond, f. Thompson, '56). 

 ii. Generally distributed, but not common. 



iii. Youghal (Ball, f. Thompson, '56) : Cork Harbour (Humphreys, 

 '45). 



iv. E. I. A. Exp., 1885, Berehaven, 7 fms. (Chaster, '98) : Yalentia 



(Cockerell, ?87). 

 V. Birterbuy Bay (Farran, f. Thompson, '56) : Killary and Clew 

 Bays (Thompson, '56) : Achill I. (Mrs. Tatlow & Praeger, 

 '98). 



vi. Carrahubbuck, Killala Bay, rather abundant (Miss A. Warren, '92). 



Bistrihution. — Arctic seas, in both hemispheres, to Mediter- 

 ranean, New England, Oregon, and Japan. Madeira (Watson). Cape 

 of Good Hope (Sowerby). 



