306 CYCLOSTOMACEA. 



32. Cyclostoma (Tropidophora) michaudi, Grat. 



2 Mauritius ; coll. Evenor Dupont, Esq. 



33. Cyclostoma (Tropidophora) barclayanum, Ev. 



This species, besides the different colour of the peristome, 

 seems to be distinguished from the preceding by its larger size, 

 more angular and everted aperture, and more numerous and 

 finer keels ; it may, however, be only a variety ? 



12 Trois Mamelles Mt., Mauritius, under immense boulders ; coll. G. Nevill, 

 Esq., and Evenor Dupont, Esq. 



34. Cyclostoma (Tropidophora) madagascariense, 



Gray. 

 5 Madagascar ; ex c. Evenor Dupont, Esq., and A. Morelet, Esq. 



35. Cyclostoma (Tropidophora) boivini, Rv. 



3 Madagascar ; ex c. Evenor Dupont, Esq. 



36. Cyclostoma (Tropidophora) bicarinatum, Sow. 



4 Madagascar ', ex c. Evenor Dupont, Esq., and As. Soc., Bengal. 



37. Cyclostoma (Tropidophora), sp. 



2 Mauritius ; coll. G. Nevill, Esq. 



Sub-Genus LITHIDION, Gray (type C. sulcatum, Gray). 

 Sub-Genus OTOPOMA, Gray. 



38. Cyclostoma (Otopoma) insular e, Pfeiffer. 



1 Loc. ? 



39. Cyclostoma (Otopoma) kraussianum, Pfeiffer. 



7 Durban, Natal ; coll. G. Nevill, Esq. 



40. Cyclostoma (Otopoma) calcareum, Sow. 



1 Madagascar; ex c. Evenor Dupont, Esq. 



41. Cyclostoma (Otopoma) asperum, P. & M. 



3 Madagascar ; ex c. Evenor Dupont, Esq. 



42. Cyclostoma (Otopoma) zanguebaricum, Petit, 



3 Zanzibar ; ex c. A. Morelet, Esq. 



43. Cyclostoma (Otopoma) sowerbyi, Pfeiffer. 



2 Mayotte, Comoro I. ; ex c. A. Morelet, Esq. 



