48 LIST OF CYCLOPHORID^E. 



i 



a— d. Jamaica. Presented by Prof. C. B. Adams. 

 e — n. ? 



19. Cyclostomus pygm^us. 



Cyclost. pygmseum Mich. Compl. a Drap. 75. n. 3. t. 15. f. 46, 

 47.; Potiez et Mich. Gal. Moll. Douai, i. 240. n. 17. t. 24. f. 

 15—17. 



Cyclost. pygmsea Lamck. An. s. Vert 2nd ed. viii. 373. n. 44. 



Hab. South of France. 



21. TUDORA. 



Operculum shelly, flat, of few whorls concentrically striated (Potiez, 

 figure). — Shell ovate. Peristome much expanded, slightly re- 

 flexed, especially on inner edge, where it nearly conceals the 

 umbilicus. 



Differs from Choanopoma in having no appearance of the 

 inner of the two lips.; 



1. TUDORA SIMTLIS. 



Cyclost. \ megacheilos Potiez 8p Mich. Moll. Gal. Douai, i. 237. 



t. 24. f. 9, 10. ; Pfeiffer, 1. c. 106. n. 55. 

 Cyclost. megachilum Pfeiffer, Kuster, Chemn. Conch. Cab. 66. n. 



62. i. 19. t. 9. f. 15—19. 

 Cyclost. simile Gray MS. in Sow. Thes. Conch, i. 103. n. 37. t. 



24. f. 48, 49. 



a — g. Orient. 



22. CHOANOPOMA. 



Operculum calcareous, thin, externally deeply concave; the whorls 

 rather narrow, terminating externally in more or less prominent 

 thin lamellae, with a subcentral nucleus. — Shell turbinate, 

 globose, or turrited, often truncate. Peristome double ; the 

 internal continuous, circular; the external rectangular, ex- 

 panded. 



Choanopoma Pfeiffer in Menke and Pfeiffer, Z. f. Malak. 1847, 

 47. and 107. 



Cistula Humph. Mus. Calonne, 1797 ; Swainson, Malac. 21. 1840. 



Licina /3. Gray, Syn. 1840, 1842, 91., Proc. Zool. Soc. 1847, 181. 



