PLATE X. 



Hyal^ea. Fam. Pteropoda. 



1. H. trispinosa, Lesueur. — Once taken on floating timber, Dublin. 



Doubtful as British. 



Spirialis, or Peracle. Fam. Pteropoda. 



2. S. Flemingii, Forbes. — Fusus retroversus, PL — Zetland, Skye, Ar- 



ran, Donegal, M. C. Snail- shaped. 



3. S. Macandrei, F. and H. — Near Mizen Head, S. Ire., Rr. Tur- 



reted. 



4. S. Jepfreysii, F. and H. — Brit. Channel, Rr. Discoid. 



Chiton. Sedentary on rocks. 



6. C. fascicularis, Linn. — Brit co. generally, Mc. Tufted margin, 

 small, granules large. 



6. C. gracilis, Jefr. Attn. Nat. Hist., Jan. 1859. — "Weymouth. 



Narrow; granules very small; two postero-terminal tufts. 



7. C. discrepans, Brown. — crinitus, Pennant? — Tenby, Guernsey, 



C. Tufted margin, large : granules very small. 



8. C. HaNleyi, Bean. — Scarborough, Skye, W. Ireland, R. Spinose 



margin. 



9. 10. C. marmoreus, 0. Fabr. — C. latus, Lowe, C. lavigatus, ruler, 



and pictus. — - Scarborough, Porth, Skye, Zetland, W. Ire., R. 

 Margin smooth. 



11. C. l^vis, Pennant. — C. marginatus, Pult., C. Achatina, Brown. 



— Dorset, Devon ; Brit. co. generally, but rare. Dorsally ele- 

 vated; margin reticulated. 



12. C. ruber, Linn. — Brit, seas generally, Mr. Yalves smooth; mar- 



gin coriaceous. 



13. C. cinereus, Linn. — C. marginatus, Perm. ? — Brit. co. generally, 



C. Valves carinated ; margin and valves granulated. 



14. C. albus, Linn. — C. asselloides, Lowe. — Northern coasts, R. Mar- 



ginal granules scaly and large ; dorsal gr. smaller than C. cinereus. 



15. 16. C. assellus, Chemn. — C. minimus, Cinereus albus. — Brit. co. 



generally, C. Broad, granules on valves beaded. 



17. C. cancellatus, Sowerby. — C. albus, Pult. — Devon, Guernsey, Isl. 



Man, Oban, Zetland, Loch Carron, R. Narrow, back elevated, 

 else like C. assellus. 



Patella. (Limpet.) Sedentary. 



18. P. vulgata, Linn. — Brit, generally, Cc. Ribs not toothed. 



