DIPLOMMATINA. CHONDROPOMA 55 



«— -f. India ; Simla, near Sutlej. From Mr. Hutton's Col- 

 lections. Carychium costatum Hutton. 

 g — ii. (With operculum.) Landour. From the Collection 

 of Capt. Boys. 



§§ Apex blunt 



2. DlPLOMMATINA COSTULATUM. 



Carychium costulatum Hutton MS. 

 Diplommatina costulatum Benson, I.e. 194. 

 Carychium parvulum Boys MS. Brit. Mus. 



Probably only a smaller variety of the preceding. 



a — x. (With operculum.) Landour. From the Collection of 

 Capt. Boys. 



3. ? Diplommatina minus. 



Cyclost. minus Sow. Thes. Conch, i. 153. n. 175. t. 30. f. 249. ; 

 Pfeiffer, Kuster, Chemn. Conch. Cab. i. 19. t. 17. f. 9 — 11., 

 ZeitschA.c. 112. n. 6. 



a — d. Zebu, Philippine Islands. From the Collection of Mr. 

 Cuming. 



24. CHONDROPOMA. 



Operculum ovate, subcartilaginous ; whorls few, rapidly increasing. 

 — > Shell for the most part turrited, often truncated. Peristome 

 continuous, for the most part free, simple, single ; expanded or 

 thickened. 



Differs from Cyclostomus in the operculum being thinner and 

 somewhat horny. 



Chondropoma Pfeiffer in Menke wnd Pfeiffer, Z.f. Malak. 1847. 



§ Shell turrited. 



1. Chondropoma limbiferum. 



Cyclost. limbiferum Menke MS. in Pfeiffer, Zeitsch. fur Malak. 



1846, 45. ; Pfeiffer, Kuster, Chemn. Conch. Cab. 46. n. 38. i. 19. 



t. 6. f. 11, 12. t. 21. f. 6. 

 Cyclost. catenatum Gould, Bost. Journ. iv. 1. 1842 ? 

 Chondropoma limbiferum Pfeiffer, 1. c. 109. n. 4. 



Hab. Cuba. 



2. Chondropoma semilabre. 



Cyclost. semilabris Lamck. An. s. Vert. vi. 2nd ed. viii. 357. n. 12.; 

 De Lessert, Recueil, t. 29. f. 1. a, b. 



c 4 



