229 



belong also to the Jckalina type. B. neuriciis, Guineensis, and vivipara 

 are three fragile species of different habits from the same country, and an- 

 other type is presented in B. lumefactus and pemphigodes with peculiarly 

 globose inflated shells. As an instance of the mingling of types on the 

 confines of the great provinces of distribution which meet in North Africa, 

 it may be remarked that B. Ruppellianus inhabiting the eastern confines 

 belongs to this Ac/ialina type, and B. reticulatus inhabiting the western 

 belongs to the Syrian Bulimus type, which is exactly the reverse of the 

 general typical character of the Bulimi in these localities. B. Downsii, 

 found abundantly at Princes Island off the coast of Guinea, inhabits also 

 the nearest mainland. At St. Helena a small brown species is found, B. 

 Helena ; and in the more elevated parts of the island, in an apparently 

 semifossil state, the remains of an extinct type, B. auris-vulpina, are found. 

 Mr. Darwin, who observed this well-known species at St. Helena imbedded 

 in the soil, attributes the extinction of it to some recent geological dis- 

 turbances, which caused the entire destruction of the woods and conse- 

 quent loss of food and shelter to the snails. 



Nothing is known of the Bulimi of Africa, south of the tropics, except- 

 ing those described by Dr. Krauss from the neighbourhood of Natal. 

 Eight species collected in this part are of very miscellaneous character, 

 but typically distinct from those of the west coast. B. Natalensis, conulus, 

 and spadiceus are thin and globosely convoluted, B. Burchellii and meri- 

 dionalis are of light ovate form, and B. linearis and turratformis are elon- 

 gated. They are all small. A very remarkable species has, however, been 

 discovered in this locality, B. Kraussii, nearly equal in size to the largest 

 Bulimus of tropical America, and as brilliant in colour. Prom Mozam- 

 bique we have but one small light species, B. Mozambicensis. In Mada- 

 gascar are two species of large size and elongated form, B. clavator and 

 obtusatus, differing essentially from any of the continental types ; and in 

 the Seychelle Islands are two, B.fulvicans and velutinus, partaking in 

 some measure of the smaller Natal species. In Mauritius there is only 

 one small ground species, B. clavulinus. 



1. Abyssinicus, Hupp. 



2. abyssoruni, D'Orb. 



3. Ackatinaceus, Pfr. 



4. acuminatus, Sow. 



5. acutus, Miill. 



6. Adamsii, Reeve. 



7. Adamsoni, Gray. 



8. Adansoni, Pfr. 



Species. 



9. adoptus, Reeve. 



10. iEgle, Brod. 



11. affinis, id. 



12. Africanus, Reeve. 



13. albatus, Per. 



14. albicans, Brod. 



15. albizonatus, Reeve. 



16. Alepi, Per. 



17. Alto- Peruvianus, Rve. 



18. alternans, Beck. 



19. alutaceus, Reeve. 



20. ambustus, id. 



21. Andicola, Pfr. 



22. angiostoma, Wagner. 



23. angulatus, id. 



24. Antoni, Pfr. 



