PLATE XVIII. 



Triton. 



1. T. COTACEUS, Linn. — Channel Isls., Rr. as Brit. Mr. Lukis's spe- 



cimen taken living off Guernsey. 



2. T. NODiFERUs, Lamk. — Guernsey ; three living specimens, one 



iucrusted with Lepralia coocinea (truly British), Mr. Jeffrey's 

 specimen reduced. 



MUEEX. 



3. M. ERINACEOS, Linn. — Purpura scalata, var. M. Tarentinus. — Brit, 



CO. generally; 5 to 30 fatli., C. N. and S. Eu. 



4. M. coRALLiNus, ScaccM. — Fusus?l\xA. M. lavatus, inconspicuus, gyri- 



niis, and baclius ? — Channel Isls. and S, Eu., C. 

 M, RUDis. See TropJion. 



Purpura. 



5. P. LAPiLLUS, Linn. [Bticcitium.) — B. and P.jilosum, imhrieatum, 



and bizonalis. — In crevices on shores, Brit. co. generally, N. 

 and S. Eu., C. 



Lachesis. 



6. L. MINIMA , 3Iont. [Buecinum.) — B. brunneum, B. nibrum, Nesaa 



granulata, mamillata, Fusus minimus, etc. — Channel Isls. and S. 

 Brit., on shores. S. Eu. 



BUCCINUM. 



7. B. HoLBOLLii. — Mangelia H. — Cornwall, Er. 



8. B. UNDATUM, Linn. — B. striatum, anglicanum, pyramidale, impe- 



riale, etc. — Brit. co. generally, shores, Cc. N. Eu. and Am. 



9. B. ACUMINATUM, Brod. — B. undatuni var., B. M. — Rr. 



10. B. CILIATUM, Fabr. {Tritonitim.) — Shetland, deep water, E. More 



thin than No. 9 ; with strise finer, and hairs of epidermis tufted 

 minutely. 



11. B. FUsiFORME, Brod. — Cork, Wexford, Rr. Turreted, fusiform, 



white, ribbed, striated. 



12. B. Dalei, Sowerbi/. — B. ovum, Halia Flemingiana. — Torbay, 



Northumberland, Aberdeen, etc., R. Ventricose. 



13. B. Humphreysianum, Bennett. — Tritonium H. — Cork, Skye, Ban- 



try Bay, R. Light, smooth. 



Eusus. 



14. E. BERNiciENSis, King. — Northumberland, Rr. Carinated, with 



open pink mouth. 



