FRESHWATER GASTROPODA FROM MADAGASCAR. 379 



9. Melania amarula {Brug.}. 



Bruguiere, Eucycl. Method, t. 458, Bulimus amarula. 



Locality. Cf. no. 1. 



Ten examples, all juvenile. The spines in all appear to be rather short 

 when compared with examples of the same age from Mauritius. 



According to von Martens, Moll. Manr. 1880, p. 2 1 1, the " Voluta Jiuviutilis " 

 o£ Kumphius from Amboina, compared by Rumphius to Linne's Helix 

 amarula, is the same as this species. This gives an eastern extension of the 

 species, which is otherwise known from the Comoros, Bourbon, and Mauritius, 

 and the present locality. 



1 0. Melania tuberculata. Mailer. 



Miiller, Verm. no. 378, Melania tuberculata. 



Locality. Cfo no. 1, 



Rather smooth examples with little tuberculation and marked spiral sculp- 

 ture, the body-whorl rather ventricose. 



11. *Tropidophora bicarinata^ Sowerhy. 



Sowerby, Thesaurus, vol. i., Cyclostoma, p. 120. 



Forest of Folohy. 



Tn woods 300 to 600 m. alt. between Matilavu and Mangoro. . 



Vide under 12. 



12. *Tropidophora betsiloensis, E. a. Smith. 



Smith, P. Z.S. 1882. 



In woods 300 to 600 m. alt., between Matilavu and Mangoro, and near 

 Lake Alaotra. 



This species is very near the preceding, and it is possible that further 

 investigation upon a good supply of material would furnish intervening links. 

 As it is, the two species appear to be divisible upon the nature of the 

 umbilicus alone, which is uncovered in betsiloensis. 



13. *Tropidophora congenera, LJ. A. Smith. 



Smith, 1. c. 



Woods, on limestone soil, Ambongo. 

 A single weathered example. 



This species is, as Smith admits, very closely related to another Malagasy 

 form, C. consanguineum, Sowerby. 



14. ? *Tropidophora sp. ? 



One example from woods on limestone soil, Nomoroko, Ambongo. 



