PLATE XI. 



FiSSURELLA. 

 Fig. 



1. F. RETICULATA, Bonov. {Patella.) — P. and F. Qraca, apertura 



(young), cancellata, europaa. — Hebrides, Thanet, Devou, Ire- 

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



2. r. cosTARiA, Beshayes. — Guernsey, E. More fine and numerous 



ribs than F. reticulata. 



PONCTURELLA. 



3. P. NoACHiNA, Linn. [Patella.) — Cemoria Flemingii, Fissnrella N., 



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

 100 fath., E. With slit under apex. 



Emarginula. 



4. E. reticulata, Sowerhy. — Patella fismr a, etc. — Brit. co. generally, 



C. Conical, with slit in margin. 

 6. E. rosea, Bell. — E. jnleoliis, conica, capuliformis, etc. — Channel 

 Isls., Esmouth, Cornwall, etc., 7 to 26 fath., Mc. Curved, 

 coarsely cancellated. Eed within. 



6. E. CRASSA, Sowerhy. — Loch Fyne, Oban and Belfast, 20 to 25 



fath., Er. 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, Limi. — Lincolnshire, Er. More simply conical than 



the most extreme forms of T. zizyphinus. 



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



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



11. T. MiLLEGRANUS, PhiUppi. — T. CkalaiuU, T. Martini. — Brit. co. 



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

 nent margin. 



12. T. GRANULATUS, Bom. — T. papillosum, T. fragilis. — Channel Isls., 



Weymouth, Dublin, etc., E. 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. 



