500 Proceedings of the Royal Irish Academy. 



Propilidium ancyh'ide (Forbes), 

 i., . . iv., v., . 

 i. Oa Ballycastle, living (Chaster '97a) : off Maidens, 70-100 fms., 

 liviag (Hyndman, '58, '59) : Turbot Bank, frequent, dead 

 (Hyndnian, '58, '59) : off Black Head, 25 fms. (Hyndman, '58) : 

 Antrim coast, 18-100 fms. (Hyndman, <S:c., f. Jeffreys, '65) : 

 Strangford Lough, on oysters (Hyndman, f. Thompson, '56). 

 iv. "Porcupine" Exp., 1869, 85-110 fms. (Jeffreys, '82): R. I, A. 



Exp., 1885, 1886, 5-44 fms. (Chaster, '98). 

 V. Coast of Galway, not uncommon on stones and among nuUipores 

 (Barlee, f. Jeffreys, '65): "Porcupine" Exp., 1869, 173-208 

 fms. (Jeffreys, '82). 

 Bistrihuiion. — Iceland. Loffoden I. to ^Mediterranean. Canaries, 

 '' Talisman " (Locard). Davis St., " Yalorous." 



Eamily. — Patellid^. 

 Patella vulgata, Linne. 

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



On rocks, &c., between tide-marks, everywhere round the coast. 



Yar. intermedia, Jeffreys. Cork (Humphreys, f, Jeffreys, '65). 

 Yar. depressa, Pennant. Magilligan, occasional (Miss Galwey, 

 '88) : Bangor (Belfast Mus., f. Praeger, '89) : coast of Down, 

 living (Hyndman, '60) : Dublin coast, generally distributed : 

 Greystones (Adams, '78) : Sherkin Island, co. Cork 

 (A, E. jST.) : Roundstone (Alcoek, '65) : Melmore, MuLroy, 

 CO. Donegal (Hart, '92). 



Distrilution. — I^orway to C. Yerd I. ? Mediterranean, 



Selcion pellucidum (Linne). 



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



Generally distributed on Lamiaarise round the coast, and apparently 

 also var. Icevis, Pennant. 



Distrihuiion. — Iceland. Pinmark to Mediterranean. 



Family. — FissuiiELLrD^. 



Fissurella grceca (Linne). 



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



Generally distributed round the coast, but sparingly. 

 Distribution. — Shetland to Mediterranean. Madeira. Canaries. 



