4 



Sub-Genus Cerithium. 



734 1-2 Cerithium muscarum (Say.), Florida, Bahamas. 

 7343-4 Cerithium ustum (Hombr. et Jacq.), Solomon's 

 Archipelago. 



.. ^ . . . u :i * t;: ' >^W- n3 V ?&9ihfiic@ /iiUJjI" < 



736. Cerithium obeliscus (Brug.), E. Ind., Poly., Mauri- 

 tius. 



737. Cerithium Kochii (Phil.), E. coast of Africa. 



738. Cerithium asper (Linn.), Singapore, Maur.-,' Mada- 

 gascar, Friendly Is. 



739. Cerithium faciatum (Brug.), Ind. O., Phil. 



740. Cerithium Pharos (Hinds), Paumotus, Vitils , Ind 

 O. 



741. Cerithium vertagus (Linn;), 'East Indies, Phif^ ; 



GENUS BITTIUM (LEACH) [GRAY] 

 741 1-2 Bittium lacteum (Phjl.^Med. S., Canary Is. 



GENUS POTAMIDES (BROV^On, i 

 Sub-Genus Pyrazus (Montfort). 



742. Potamides ebeninus (Brug.), Austr., New Zealand. 

 SUB-GENUS TYMPANOTONOS (KLIEN) 



743. Potamides fuscatus (L.), Gambia, Cape Palmas, W 

 Africa. 



744. Potamides radula (Linn.), W. Africa, 



745. Potamides fluviatilis (Potiez et Michavd), Ind. O., 

 Singapore, Borneo, China, Jap., Phil., Austr. 



746. Potamides palustris (L.), India, Java, Austr. 



SUB-GENUS TEREBKALIA (SWAINS.) 



747. Potamides sulcatus (Born.), Singapore, China, 

 Phil. 



r "} / j C* "f I Tl T 1 5 1 ! 'I" ) *f \\ I/ /' ''I 

 SUB-GENUS TELESCOPIUM (MONTF.) 



748. Potamides telescopium (L.), India, Singapore, 

 Phil., Borneo. 



J!d c 



, nfi c3 SU3-GENUS CERITHIDEA (SWAINS.) 



749. Potamides decollata (L.), India, Timor, Madagascar. 

 749 1-2 Potamides scalariformis (Say.), Florida. 



749 3-4 Potamides iostoma (Pfr.), So. Carolina, W. L, 

 Belize. 



