90 



BOOK OF SPECIES. 



a great tubercle; mouth small, sub-rotund, white; 

 columella yellow. 3^. 



M. TRiQUETER. Obloiig, sub-fusiform, sub- 

 triangular in its transverse outline, somewhat 

 plaited longitudinally, and transversely furrowed ; 

 white, sometimes with rufous splotches ; varices 

 membranaceous ; lip crenated ; aperture elliptical. 

 W. 25. 16. 



*** Tail short ; more than three varices. 



M. SAX ATI LIS. Sub-fusiform, very ventri- 

 cose, with six foliated varices, which are usually 



