Stelfox — List of Land and Freshwater- Mollusks of Ireland. 101 



did not look for more specimens. At 

 Glenade, however, it appeared common 

 under stones near the outlet of the 

 lake, associated with Vertigo pygmaea, 

 V. antivertigo, V. substriata, Syalinia 

 radiatula, Carychmm mininmm, Succinea 

 pfeijferi, Limnaea palustris, and L. trun- 

 catnla. The great majority of the 

 specimens taken in this last habitat were 

 small — smaller, in fact, than the accom- 

 panying specimens of V. pygmaea ; but 

 . several were equal in size to those 

 usually found in "West Galway. Dr. 

 Scharfl's record from the Aran Islands 

 has not been verified ; and, as his speci- 

 men was unfortunately lost before the 

 identity of the shell was definitely 

 known, he considers it safer to omit the 

 record from the present paper, though 

 there can be little doubt that it was 

 this shell that he found on Inishmore. 

 Like Vertigo moiilinsiana and the other 

 members of the genus, this shows no 

 preference for any particular geological 

 formation ; and its Irish habitats lie 

 in Old Red Sandstone, Carboniferous 

 limestone, and metamorphic areas. 



Yertigo alpestris (Alder). 

 WD ]^D LD AN 



FE TY AR DO 

 WMSL LE MO 



BMRO CV LH 

 WGNG LP WHME 

 SG KG KD DU 

 CL NT QC CW WI 

 NK LK ST KK WX 

 SK MC EC WA 

 WC 



Since Mr. Adams discovered this rare 



species near Coleraine, in Derry, it 

 has been taken in two other northern 

 localities in the adjoining counties by 

 Mr. Standen, namely, at Whitepark in 

 Antrim, and Portsalon in West Donegal. 

 Mr. Hogan's supposed discovery of this 

 shellin Co. Dublin is known to be an error. 

 Dr. Scharffl is inclined to think that the 

 shell collected at Ballintoy, Antrim, by 

 Mr. Tomlin, and recorded as Vertigo 

 heldi Clessin,' should really be con- 

 sidered a form of this species. It is just 

 possible, however, that Mr. Tomlin' s 

 specimen may be an abnormal example 

 of Vertigo pygmaea, as in the exact 

 spot where the supposed V. heldi was 

 taken I have since collected very large 

 specimens of the former species. 



Yertigo pusilla Miiller. 



WD ED LD AN 



FE TY AR DO 

 WMSL LE BIO 



EM RO CV LH 

 WG NG LF WH ME 



SO KO KD DU 



CL NT QC CW WI 



NK LiK ST KK WX 

 SK MC EC WA 



WC 



A very rare and local species in the 

 living state, but, judging from the 

 number of dead shells found in many 

 of our sand-dunes, it must formerly 

 have been much more common. It is, 

 nevertheless, widely but discontinuously 

 distributed throughout the mainland, 

 but has not been reported fi'om any of 

 our islands. The very beautiful pure- 



1 Irish Nat., xii. HO. 



