52 COLIMACEA. 



columellar lip, and three on the outer lip ; peretreme narrow, 

 white, a little reflected, with a small umbilicus behind the colu- 

 mellar lip; outer lip furnished with a longitudinal rib internally, 

 and two or three transverse, pale lines, being the reflections of 

 teeth within the aperture, and with a very slight wave ; whole 

 shell subpellucid, of a pale chestnut horn-colour, and with lon- 

 gitudinal, very minute striae, which are only perceptible by the 

 aid of a very strong lens. Length a line ; diameter not half 

 its length. 



This species has, in some few instances, an eighth tooth situ- 

 ated on the pillar lip. 



Inhabits moist woody situations, under stones. It is not a 

 rare, although a local species in Britain. Mr. Thompson, 

 however, says, it is very rare in Ireland, and has been 

 met with in the north-east and west of the island. He par- 

 ticularises Colin Glen, near Belfast, Portmarnock, and Miltown 

 Malbay. 



8. Vertigo angustior, pi. V, f. 17. 



Vertigo heterostropha, Leach, Moll., p. 130; Vertigo angus- 

 tior., Jeffreys, Linn. Tr., XVI, p. 361 ; Alder, Mag. Zool. and 

 Bot., II, p. 112; Thompson, Ann. and Mag. Nat. Hist., VI, p. 

 V 41 ; Brown, Illust. Conch., p. 42, pi. 14, f. 9; lb.. First Ed., pi. 

 41, f. 9 ; Turbo vertigo, Montagu, Test. Brit., p. 363, pi. 12, f. 

 6; Turton, Brit. Fau., p. 186. 



Shell ventricose in the middle, and tapering to both extre- 

 mities ; with four heterostrophe volutions, nearly flat on the 

 sides, and terminating in an obtuse apex ; body about a third 

 of the entire length of the shell ; aperture subtriangular, con- 

 tracted and angular on its left superior side, rather rounded 

 below ; peristome white, and somewhat thickened ; outer hp 

 thickened, slightly waved ; three white teeth, two of which are 

 on the columella, and one on the outer lip; whole shell covered 

 with fine, obliquely longitudinal striae, and of an opaque, pale 

 umber-brown colour. Length about half a line. 



This is a rare species, and is mentioned by Montagu as 

 obtained from the rejectamenta of the river Avon, Wihshire; 

 Jeffreys gives its habitat in the rejectamenta of a small stream 

 at Marino, near Swansea ; and Thompson obtained it from Mr. 

 W. H. Harvey, who found it at Miltown Malbay, Ireland. 



In pointing out the difference between this species and V. 



