VERTIGO. 85 



seven (two on the body, two on the columelia, two or 

 three inside the outer lip). 



This species is found in many parts of England and 

 Ireland, but it is local and rare. It frequents similar 

 situations to the others. 



8. Y. ANGUSTIOR (narrower). 



Of the same form, but narrower than the last species, 

 glossy, semi-transparent, horn-colour ; closely striate in the 

 line of growth ; whorls four and a half, the penultimate 

 being the broadest; mouth sub-triangular, and narrowed 

 by the strong constriction of the outer margin ; teeth four 

 to five (two on the body, one on the columelia, one inside 

 the outer lip, which is thickened and reflected) ; umbilicus 

 indistinct. 



This species is very rare and local, occurring in a 

 few localities only. In England at Bristol, Battersea 

 Fields, and in Yorkshire ; in Wales at Singleton (near 

 Swansea), Tenby, Milford, and in some of the southern 

 and western counties of Ireland. I have also found it 

 abundantly on the sand-hills at the mouth of the River 

 Bann. 



The following table of comparison may be useful to 

 assist identification : 



