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Show 300 ON SHELLS F R O M LAKE TANGANYIKA, ETC. [Feb- 15> from the other species of the genus known as inhabiting the and is easily recognized by its form and thin lamellar teeth. U. baneri H. Adams, from Lake Albert Nyanza, approaches the present species, but is much longer and much more corrugated upon tne surface. EXPLANATION OF THE PLATES. PLATE XXXII. Fig. 1, 1 a. Cyclostoma insulare, vars., p. 277. 2, 2 a, 2 b. Helix (Nanina ?) nyassana, p. 278. 3,3a. Helix (Trochonanina) mozambicensis, var., p. 279. 4, 4 a. Streptaxis yiyas, p. 279. 5, 5 a. craveni, p. 280. (5t 6 a. mozambicensis, p. 280. 6 *. Ennea Iceviyata, p. 281. 7,7 a, 7 b, 7 c. Bulimus (Rhachis) braunsii, p. 281. 8. Bulimus notabilis, p. 282. 9. (Buliminus) kirki, p. 282. 10. Achatina hamillei, p. 282. PLATE XXXIII. Fig. 11. Achatina craveni, p. 283. 12. thomsoni, p. 283. 13. (Limicolaria) caillaudi, p. 284. 14, 14 a. Achatina (Limicolaria) rectistrigata, p. 284 15. Subulina lenta, p. 284. 16. solidiuscida, p. 285. 17, 17 a, 17 b. Limnotrochus thomsoni, p. 285. 18, 18 a, 18 b. kirki, p. 286. 19. Lithoglyphus neritinoides, p. 287. 20, 20 a. Lithoylyphus rufofilosus, p. 288. 21, 21 a, 21 b. Syrnolopsis lacustris, p. 288. 22, 22 a. Ampuilaria gradata, p. 289. PLATE XXXIV. Fig. 23. Lanistes affinis, p. 290. 24. Melania (Sermyla) admirabilis, p. 291. 25. tanganyicensis, p. 291. 26, 26 a, 26 b. Melania (Melanella) nassa, p. 292. 27. Melania horei, p. 292. 28. Tiphobia horei, operculum, p. 293. 29. Paludomus ferruginous, p. 294. 30, 30 o, 30 b. Segmentina (Planorbula) alexandrina, var. tail' ganyiccnsis, p. 294. 31, 31 a. Pleiodon spekei, p. 296. 32. Spatha tanqani/icensis, p. 296. 33, 33 a, 33 b. Unio burtoni, p. 297. 34, 34 a, b. Unio nyassaensis, p. 298. 35. Unio tanganyicensis, p. 298. 36. thomsoni, p. 299. 37. horei, p. 299. |