Family CYCLOPHORID^. 



Subfamily CYCLOPHORINiE. 



Genus LEPTOPOMA, Pfeiffer. 



Leptopoma, Pfeifler, Zeits. Malak. iv, 1847, p. 108 ; id., Mon. 

 Pneiini. 1852, p. 101 ; Adams, Genera Recent Moll, ii, 18.55, 

 p. 281 ; Chenu, Man. Conchyl. i, 1860, p. 487 ; Pfeiffer, Mon. 

 Pneum. Suppl. .3, 1875, p. 127; Fischer, Man. Conchyl. 1885, 

 p. 743: Sarasin, Land-Moll. Celebes, 1899, p. 15; Kobelt, Das 

 Tierreich, Lief. 16, 1902, p. 4. 



Type, Gyclostoma vitrea, Lesson. 



Mange. Southern Asia, Malaysia, Philippines, New Guinea, 

 Melanesia. 



Shell nari'owly umbilicated, globose -turbinate or conical, 

 thin, often translucent. Peristome simple — occasionally double — 

 generally reflexed, sometimes straight, usually interrupted on the 

 penultimate whorl, but somtimes connected by a thin callus. 

 Operculum membranaceous, closely whorled, flat. 



Subgenus LEPTOPOMA, Pfeiffer (s. s.). 

 Lejjiopoma (as subgenus), Kobelt, Das Tierreich, Lief. 16, 1902, p. 4. 

 Type, Cydostoma vitrea. Lesson. 



Range. Ceylon, Malaysia, Formosa, New Guinea, Melanesia. 



Shell conical or globose-turbinate, thin, generally with brown 

 bands on a white ground. 



Ouly two species are known from Ceylon, none from the Indian 

 Peninsula. 



1. Leptopoma semiclausum, Pfeiffer. 



Cijclostoma semiclausum {Leptopoma), Pfeiffer, P. Z. S. 1854, p. 302. . 

 Leptopoma semiclausum, Pfeifier, Mon. Pneum. Suppl. 1, 1858, 



p. 70 ; Reeve, Conch. Icon, xiii, 1802, Leptopoma, pi. 6, fig. 35 ; 



Hauley & Theobald, Conch. Ind. 1870, pi. 6, fig. 2; H. Nevill, 



Enum. Helic. Pneum. Ceylon, 1871, p. -5; Theobald, Cat. 



Shells Brit. India, 1876, p. 37: Nevill, Hand List, i, 1878, 



p. 281 ; Sykes, Journ. Malac. vii, 1899, p. 26 ; Kobelt, Conch.-Cab., 



Cyclophoridae, i, 1902, p. 446, pi. 55, fig. 9. 

 Leptopoma {I^eptopoma) semiclausum, Kobelt & Mollendorflf, Nachr. 



Dents. Malak. (ies. 1897, p. 79; id., Cat. Pneum. 1899, p. 7; 



Kobelt, Das Tierreich, Lief. 16, 1902, p. 14. 



Original description : — " C. testa perforata, globoso-turbinata, 

 tenuiuscula, striis obliquis et spiralibus minute decussata, albida, 



B 



