PLATE XLIII. 
Fig. 4, 5. NERITINA fluviatilis. 
Nehitina fluviatilis. Lam. Syst. vi. partie ii. p. 188. 
Nerita fluviatilis, Mont. Test. Brit. p. 470. — Broivn in Ency. Brit. vi. p. 462. 
Fig. 14, 15, 21. NERITOIDES littoralis. 
Nebitoides littoralis. Brown's MSS. 
Nerita littoralis, Mo7it. Test. Brit. p. 467- — Broivn, Ency. Brit. iv. p. 462. 
Fig 22. NERITOIDES littoralis. Young shell. 
Fig. 8, 10. NATICA glaucina. 
Natica glaucina, Lam. Syst. vi. partie ii. p. 196. 
Nerita glaucina, Mont. Test. Brit, p. 469. — Brown in Ency. Brit. p. 462. 
Fig. 1, 2. NATICA glaucina. Young shell. 
Fig. 13, 16. NATICA canrena. 
Natica canrena. Lam. Syst. vi. partie ii. p. 199. 
Nerita canrena, Morit. Test. Brit. Sup. p. 148 Brown in Ency. Brit. vi. p. 462. 
Fig. 3, 6. NATICA RUFA. 
Natica rufa. Brown's MSS. 
Nerita rufa, Mont. Test. Brit. Sup. p. 150 — Brown in Ency. Brit. vi. p. 462. 
Fig. 9, 12. NATICA glabrissima. 
Natica glabrissima. Brown's MSS. 
Nerita glabrissimus, Brotvn in Wern. Mem. ii. p. 532, pi. 24, f. 12. 
Fig. 17, 19. NATICA pallidula. 
Natica pallidula. Brown's MSS. 
Nerita pallidula, Mont. Test. Brit. p. 468. — Brown in Ency. Brit. vi. p. 462. 
Fig. 9, 11. NATICA mammilla. 
Natica mammilla. Lam. Syst. vi. partie ii. p. 197. 
Nerita mammilla. Brown in Ency. Brit. vi. p. 462. 
Nerita nitida, Mont. Test. Brit. Sup. p. 149.— Although this species has been found in many diflferent parts of the 
coast around Great Britain, yet I am inclined to think it is not indigenous, but has been brought in ballast, 
being a common shell in the West Indies. 
Fig 18, 20. NERITA tuberosissima. 
Nerita tuberosissima, Mo?it. Test. Brit. Sup. p. 150— This shell has also a foreign aspect. 
