REGISTOMA. 289 



One species is from eastern Australia, two are from 

 New Ireland, and one is from the Philippines. 



Species of Pupina. 



aurea, Hinds. Cumingii, Pfeiff. 



bicanaliculata, Sow. Keraudrenii, Vign. 



bilinguis, Pfeiff. Thoinpsoni, Forbes. 



Genus REGISTOMA, Hasselt. 



Operculum circular, thin, membranaceous, flat, closely- 

 whorled. 



Shell oval, polished, covered with a smooth callus ; whorls 

 rather distorted, large, flattened ; aperture circular ; peri- 

 stome reflexed, inner lip thin, with a slight notch on the 

 inner side near the axis. 



Syn. Rhegostonia, Agassis. Rhexistoma, Herrm. Mou- 

 linsia, Gratel. 



Ex. R. grande, Gray, pi. 86, fig. 7. Operculum, R. 

 fuscum, Gray, fig. 7, a, 7, b. 



A small, well-marked group, nearly all from the Islands 

 of the Philippine Archipelago. 



Species of Peristoma. 



Cumingianum, Pfeiff. Nicobaricum, Pfeiff. 



exiguurn, Sow. pellucidum, Soiv. 



fuscum, Gray. simile, Sow. 

 grande, Gray. 



