PLATE XLV. 
* UmUlicated. 
Fig. 12, 15. TROCHUS magus. 
Trochus magus, Mont. Test. Brit. p. 283.— P(?««. Brit. Zool. iv. t. 80. f. 107 Brown in Enri/. Brit. vi. p. 4.')0. 
Fig. 9, 11. TROCHUS umbilicatus. 
Tbochus umbilicatus. Maul. Te.it. Brit. p. 28G — Bonov. Brit. Shells, iii. t. 75. — Three middle figures. — Tur- 
ton's Brit. Fauna, p. 178- 
Fig. 2, 8. TROCHUS tumidus. 
Trochus tumidus, Mont. Test. Brit. p. 280 — Turton, Brit. Fauna, p. 177- 
Fig. 5, 8. TROCHUS cinekarius. 
Trochus cinerarius, Mont. Test. Brit. p. 284 — Brown in Enctj. Brit. vi. p. 450 Turton, Brit. Fauna, p. 178. 
Fig. 10. TROCHUS ltneatus, Variety. — In Lady Jardine's Cabinet. 
Fig. 1, 4. TROCHUS littoralis. 
Trochus littoralis. Brown's MSS. — A new species, from Killoch, county of Down In Lady Jardine's Cabinet. 
** Not Umbilicated. 
Fig. 16, 19. TROCHUS zizyphinus. 
TbOchus zizyphinus, Mont. Test. Brit. p. 274. — Brown, Ency. Brit. iv. p. 452. 
Fig. 17, 18. TROCHUS zizyphinus, Variety without markings. — Lady Jardine's Cabinet, 
From Tenby, Wales. 
Fig. 21, 22. TROCHUS zizyphinus. 
Thochus zizyphinus, a beautiful smooth variety dredged in the German Ocean, off Sunderland, by Mr Dixon, 
Bishop- Wearmouth In Lady Jardine's Cabinet. 
Fig. 24, 29. TROCHUS zizyphinus. 
Trochus zizyphinus, a beautiful smooth variety dredged off the Coast of Down, in Ireland. — The above two 
smooth varieties are found in very deep water — Lady Jardine's Cabinet. 
Fig. 20, 23. TROCHUS discrepans. 
Thochus discrepans, Bronn in Wer. Mem. ii. p. 501. pi. 24. Figs. 4, 4. 
Fig. 6, 7. TROCHUS crassus. 
Trochus crassus, Mont. Test. Brit. p. 281. — Browti in Ency. Brit. vi. p. 452. 
Trochus lineatus, Donov. Brit. Sh. ii. p. 271- 
Fig. 13, 14. TROCHUS papillosus. 
Trochus papillosus. Mat. and Rack, in Lin. Tr. viii. p. 155 — Brown in Ency. Brit. vi. p. 452. 
Trochus tenuis, Mo7it. Test. Brit. p. 275. — Turton, Brit. Fauna, p. 177- 
Fig. 25, 26. TROCHUS erythroleucos. 
Trochus erythroleucos, Turton s Untie, v. p. 463 Brown in Ency. Brit. vi. p. 452. — Mont. Test. Brit. p. 227- 
