CISTT)LA. 57 



§§ Shell suborbicular, solid. 

 7. Chondropoma flavum. 



Cyclost. flavum Brod. Proc. Zool. Soc. 1832, 59.; Midler, 

 Synops. 38.; Sow. Thes. Conch, i. 109. n. 55. t. 24. f. 70.; 

 Pfeiffer, Kuster, Chemn- Conch. Cab. 23. n. 14. i. 19. t. 3. f. 9, 

 10. magn. f. 11., Zeitsch. I.e. (an Littorina ?) 112. n. 3. 



a — d. Chain Island, South Seas. From the Collection of Mr. 

 Cuming. 



25. CISTULA. 



Operculum ovate, thin, horny, with a very thin external shelly 

 coat ; whorls few, gradually enlarging, flat, edge simple, centre 

 rather concave. — Shell ovate elongate, or conico-turrited. 

 Mouth subcircular. Peristome double, or simple with subex- 

 panded margin. 



Licina Browne, Jamaica, 1756 ; Gray, Proc. Zool. Soc. 1847, 181. 

 Cyclostoma Swainson, Malac. 1840 (not Lamck. 1801). 

 Annularia (3. Schum. N. Syst. 1817. 



§ Peristome double. 

 * Shell conico-turrited. 



1. ClSTULA FASCIA. 



Turbo fascia Wood, Cat. Supp. t. 6. f. 8. 



Cyclost. fascia Gray in Wood's Cat. Supp. 36. ; Pfeiffer, 1. c. 105. 

 n. 30.; Kuster, Chemn. Conch. Cab. 45. n. 37. i. 19. t. 6. f. 9, 

 10. ; Sow. Thes. Conch, i. 149. n. 164. t. 28. f. 176, 177. 



a — c. Jamaica. 



d, e. Jamaica. Presented by Professor C. B. Adams. 



/, g. Jamaica. 



2. CiSTULA COLUMNA. 



Turbo column a Wood, Cat. Supp. t. 6. f. 21. 



Cyclost. columna Gray in Woods Cat. Supp. 36. ; Lamck. An. s. 

 Vert. 2nd edit. 372. n. 41.; Pfeiffer, 1. c. 105. 45.; Kuster, 

 Chemn. Conch. Cab. 47. n. 39. i. 19. t. 6. f. 13, 14. 



a, b. Jamaica. Presented by Professor C. B. Adams. 

 c—f. Jamaica. Jun. Presented by Rev. Barham Zincke. 



Var. Suture crenulated. 



Cyclost. Adamsi Pfeiffer, 1. c. 105. n. 35., Zeitsch. Malak. 1846, 

 43. ; Kuster, Chemn. Conch. Cab. 48. n. 40. i. 19. t. 6. f. 20, 21. 



c 5 



