PLATE XVIII. 



Triton. 



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



cimen taken living off Guernsey. 



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



incrusted with Lepralia coccinea (truly British) . Mr. Jeffrey's 

 specimen reduced. 



Murex. 



3. M. erinaceus, Linn. — Purpura scalata, var. 31. Tarentinus. — Brit, 



co. generally ; 5 to 30 fath., C. N. and S. Eu. 



4. M. corallinus, Scacchi. — Fususand. 31. lavatus, inconspicuus, gyru 



n%s, and badius ? — Channel Isls. and S. Eu., C, 

 M. rudis. See Trophon. 



Purpura. 



5. P. lapillus, Linn. (Buccinum.) — B. and P.jilosum, imbricatum, 



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

 and S. Eu., C. 



Lachesis. 



6. L. minima , 3Iont. (Buccinum.) — B. brunneum, B. rubrum, Nesaa 



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

 Brit., on shores. S. Eu. 



Buccinum. 



7. B. Holbollii. — Mangelia H. — Cornwall, Rr. 



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



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



9. B. acuminatum, Brocl. — B. undatum var., B. M. — Br. 



10. B. ciliatum, Fabr. {Tritonmm.) — Shetland, deep water, B. More 



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

 minutely. 



11. B. fusiforme, Brocl. — Cork, Wexford, Br. Turreted, fusiform, 



white, ribbed, striated. 



12. B. Dalei, Sowerby. — B. ovum, Halia Fleming/ana. — Torbay, 



Northumberland, Aberdeen, etc., R. Ventricose. 



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



try Bay, R. Light, smooth. 



Fusus. 



14. P. berniciensis, King. — Northumberland, Rr. Carinated, with 



open pink mouth. 



