240 ELLOBIIN/E. 



white. Species of Pythia are most numerous in the East 

 Indian and Philippine Islands ; a few, however, have been 

 discovered in the Pacific Islands. 



Species of Pythia. 



albovaricosa, Pfeiff. Macgillivrayi, Pfeiff. 



Argenvillei, Pfeiff. ovata, Pfeiff. 



Borneensis, A. Adams. pantherina, A. Adams. 



castanea, Less. plicata, Ferus. 



Cecillei, Phil. pollex, Hinds. 



Celebensis, Pfeiff. pyramidata, Peeve. 



Ceylanica, Pfeiff. Keeveana, Pfeiff. 



chalcostoma, A. Adams. scarabseus, Linn. 



Cumingiana, Petit. semisulcata, A. Adams. 



imperforata, A. Adams. sinuosa, A. Adams. 



inflate, Pfeiff. striata, Reeve. 



lekithostoma, Pfeiff. trigona, Trosch. 



Lessoni, Blainv. undata, Less. 



Genus PLECOTREMA, H. and A. Adams. 



Shell ovate, solid, umbilicated; spire elevated, conic, 

 whorls transversely grooved ; aperture contracted, oblong ; 

 inner lip with three plaits, the middle plait bifid ; outer lip 

 with a marginal varix, internally bidentate. 



Ex. P. typica, H. and A. Adams, pi. 82, fig. 4. 



The head-quarters of this genus, the examples of which 

 are all of small size, appear to be the East Indian and 

 Philippine Islands, although Australia and the Sandwich 

 Islands have supplied us with one or two species. 



