PLATE XL 



FlSSURELLA. 

 Kg. 



1. F. reticulata, Donov. (Patella.) — P. and F. Grceca, apertura 



(young), cancellata, europcea. — Hebrides, Thanet, Devon, Ire- 

 land. On shells, etc., 1 to 15 fath., C. 



2. F. costaria, Beshayes. — Guernsey, R. More fine and numerous 



ribs than F* reticulata. 



PuNCTURELLA. 



3. P. Noachina, Linn. (Patella.) — Cemoria Flemingii, Fissurella N., 



Rimula Flemingii, etc. — Scotland and Northumberland, 20 to 

 100 fath., E. With slit under apex. 



Emarginula. 



4. E. reticulata, Sowerby. — Patella fissur a, etc. — Brit. co. generally, 



C. Conical, with slit in margin. 



5. E. rosea, Bell. — E. pileolus, conica, capuliformis, etc. — Channel 



Isls., Exmouth, Cornwall, etc., 7 to 25 fath., Mc. Curved, 

 coarsely cancellated. Red within. 



6. E. crassa, Sowerby. — Loch Fyne, Oban and Belfast, 20 to 25 



fath., Rr. Large, not cancellated. 



Haliotis, or "Ear-shell." 



7. H. tuberculata, Leim. — H. vulgaris, Channel Isls., Cc. 



Trochus. 



8. T. zizyphinus, Linn. — C. conulus, C. discrepans, C. Lyonsii (white, 



ribbed var.), etc. Brit. co. generally, low-water to 50 fath., C. 



9. T. conulus, Linn. — Lincolnshire, Rr. More simply conical than 



the most extreme forms of T. zizyphinus. 



10. T. alabastrum, Bech. — T. formosus. — Zetland, Lerwick, etc., 45 



to 80 fath., R. White, with deep, plain,, and beaded ridges. 



11. T. millegranus, PhUippi. — T. Clealandi, T. Martini. — Brit. co. 



generally, 15 to 90 fath., Mr. Grauulated, whorls with] promi- 

 nent margin. 



12. T. granulatus, Born. — T. papillosus, T. fragilis. — Channel Isls., 



Weymouth, Dublin, etc., R. Like 8, but grained. 



13. T. striatus, Linn. — T. parvus, etc. — S. Brit., C. More finely 



ribbed than T. exiguus. 



14. T. exiguus, Pult. — T. exasperatus, minutus, etc. S. co., C. 



