BALIA. 87 



motion ; though my experience of the species is con- 

 fined to a single locality in the north of Ireland, where 

 it and its variety are abundant. 



There is no mistaking this species for any other, as 

 its shape and toothless mouth mark it off distinctly 

 from any of the foregoing, and its size from the follow- 

 ing species. 



Var. columella. Longer, last whorl broader. 



10. V. MINUTISSIMA (very minute). 



Cylindrical, glossy, different shades of horn-colour; 

 closely striated in the line of growth; whorls five and a 

 half; suture deep; mouth similar to the last species, hut 

 somewhat quadrangular ; umbilicus small. 



This beautiful little shell is found in a few places in 

 Scotland and England. 



It is much smaller and narrower in proportion to its 

 size than V. edentula, and is more strongly striated. 



Genus VIIL BALIA. 



B. PERVERSA (turned the wrong way). 



Sinistral, club-shaped, thin, dark horn-colour, semi- 

 transparent, glossy, closely striated in the line of growth ; 

 whorls seven to eight ; mouth squarish oval, sometimes fur- 

 nished with a denticle on the columella ; outer lip thin ; 

 umbilicus narrow. 



