CALLIA. LEONIA. LITHlDXOft. OfOPOMA. 35 



Cyclost. mamillare Sow. Thes. Conch, i. 102. n. 35. t. 24. f. 45, ; 



Kuster, Chemn. Conch. Cab. i. 19. t. 14. f. 28, 29. ; Pfeiff. 1. c. 



105. n. 20. 

 Cyclost. Voltzianum Mich. Coq. dAlgers, 10. n. i. f. 21, 22.; 



Potiez et Mich. Gal. Moll. Douai, i. 243. n. 23. bis, t. 24. f. 24, 



25. 

 Cyclost. Volziana Lamck. An. s. Vert. 2nd edit. viii. 371. n. 39. 

 Cyclost. lsevigatum Sow. MS. in Cab. Gray, not Thesaurus Conch. 



a — h. Oran, Algiers. 

 i — m. Var. larger. ? 



17. LITHIDION. 



Operculum subcircular, shelly ; whorls rather rapidly enlarged, 

 with a strong, convex, subcentral keel, and simple edges. — Shell 

 depressed, broadly umbilicated, open. Mouth circular. Peri- 

 stome simple. 



1. LlTHIDION SULCATUM. 



Cyclostoma lithidion Sow. Thes. Conch, i. 111. n. 61. t. 31. f. 262.; 

 Kuster, Chemn. Conch. Cab. i. 19. t. 20. f. 20—22.; Pfeiffer, I.e. 

 112. n. 4. 



a. Yemen, Arabia. 



18. OTOPOMA. 



Operculum shelly, solid ; whorls convex in the centre, with simple 

 edges. — Shell subglobose, solid, umbilicated, with an ear-like 

 process from the inner side of the mouth, covering part of the 

 axis. Mouth circular. Peristome simple, or slightly reflexed. 



§ Whorls rounded in front of axis. 

 1. Otopoma foliaceum. 



Turbo foliaceus Chemn. Conch. Cab. xi. 59. t. 123. f. 1069, 1070. ; 



Gmel. Linn. Syst. Nat. 104. 

 Cyclost. foliaceum Pfeiffer, Kuster, Chemn. Conch. Cab. 36. n. 27. 



t. 4. f. 10, 11. 

 Cyclost. naticoides Recluz, Rev. Zool. 1843, 3., Mag. Zool. 1843, 



t. 73. ; Sow. Thes. Conch, i. 117. n. 78. t. 26. f. 108, 109.; Pfeiff. 



1. c. 104. n. 1. ; Kuster, Chemn. Conch. Cab. 37. n. 28. i. 19. t. 5. 



f. 1—4. 

 Cyclost. clathratulum Recluz, Rev. Zool. 1843, 3., Mag. Zool. 



1843, t. 74.; Sow. Thes. Conch, i. 97. n. 17. t. 23. f. 15, 16.; 



B 6 



