42 list of cyclophorhle. 



17. ? Tropidophora Duisabonis. 

 Cyclost. Duisabonis Grat ; Pfeiff. 1. c. 106. n. 66. 



18. Tropidophora Terveriana. 



Cyclost. Terveriana Grat. 



Trop. Terveriana Pfeiff. I.e. 106. n. 7. 



19. Tropidophora Abelllei. 



Cyclost. Abeillei Grat. 



Tropidoph. Abeillei Pfeiffer, I.e. 106. n. 3. 



20. CYCLOSTOMUS. 



Operculum shelly, few-whorled ; whorls flat, last broad ; nucleus 

 excentric. — Shell globoso-conical, or conical-turrited, thin. 

 Axis open, simple. Peristome simple or double, continued, 

 straight or expanded. 



Cyclostomus Montf. Conch. Syst. 1810; Gray, Proc. Zool. Soc. 



1847, 181. 

 Cyclostome (Cyclostoma) Lamck. Ext. du Cour. 1812. not Syst. 



1801 ; not Bosc, 1802; not Schum. 1817, 196. 

 Cyclostoma sp. Lamck. Ann. Mus. iv. 109. 212. 1803, Phil. Zool. 



1804; Drap. Hist 25. 28. 32. 1805; Studer, Verz. 21. 1820; 



Hartmann, Sturm. Fauna, 35. 1821, 1840; Troschel in Menke, 



Zeitsch.f. Malak. 1847, 43. ; Pfeiffer in Menke und Pfeiffer, Z. 



f. Malak. 1847, 104. 

 (3. Leonia Gray, Syn. Brit. Mus. 1840 {Cyclost Volsii). 



§ Peristome simple, slightly refiexed. 



* Axis widely umbilicated. Shell globoso-conical. 



1. Cyclostomus ligatus. 



Nerita ligata Midler, Hist Verm. ii. 181. n. 368. 



Turbo ligatus Chemn. Conch. Cab. ix. 60. t. 123. f. 1071-72. ; 



Wood, Ind. Test. t. 32. f. 122. 

 Cyclostoma ligata Lamck. An. s. Vert 2nd ed. viii. 359. n. 20. 

 Cyclost. ligatum Sow. Thes. Conch, i. 98. n. 21. t. 23. f. 24.; Potiez 



et Mich. Gal. Moll. Douai, 234. t. 23. f. 23, 24.; Pfeiffer, Kuster, 



Chemn. Conch. Cab. i. 19. t. 4. f. 12. 15. t. 8. f. 3, 4., Zeitsck. 



1. c. 104. n. 8. ; Krauss, Sudafrik. Mollusk. 82. n. 1. 

 Cyclophora ligata Swainson, Malac. 336. 



a, b. ? 



e — e. Syria ? 



/. Cape' of Good Hope. From the Collection of Dr. Krauss. 



