284 puriNiM. 



Sub-fam. PUPININiE. 



Operculum horny, thin, orbicular, of many very gradually- 

 enlarging whorls ; nucleus central. 



Shell oblong-elongate, last whorl with a fold or spiral 

 ridge on the inner side, in front of the axis, sometimes form- 

 ing a groove in the outer lip. 



Genus MEGALOMASTOMA, Guilding. 



Operculum horny, thin, sub-circular, closely-whorled, fiat. 



Shell scarcely perforated, cylindrical or pupiform, covered 

 with a thin epidermis, last whorl with a slight ridge round 

 the umbilical region; aperture circular ; peristome continuous, 

 double, expanded and thickened, the columellar margin 

 sometimes slightly notched. 



Syn. Farcimen, Trosch. Megaloma, Woodw. Lo- 

 mastoma, Woodw., not Eajin. 



Ex. M. altum, Sowerby, pi. 8G, fig. 1 . Operculum, M. 

 altum, fig. 1, a, 1, b. Shell, M. altum, fig. 1, c. 



Although the West-Indian Islands seem to be the head- 

 quarters of this genus, most of the species being natives of 

 Cuba, Haiti, and St. Vincent, one example, M. sectilabrum, 

 Gould, is found in Tavoy, another, M. pauperculum, Sow., 

 in Assam, and a third, M. funicirialum, Benson, in the 

 Eastern Himalaya. 



species of Meyalomastoma . 



altum, Sow. bifasciatum, Sow. 



alutaceum, Mke. bituberculatuin, Sow. 



Antillarum, Sow. chrysalis, Pfeiff. 



auriculatum, UOrb. croceum, Sow. 



