COLIMACEA. 51 



borough; Wimbledon Common; near Twizil House, Northum- 

 berland, the seat of J. P. Selby, Esq.; and in Ireland, in many 

 localities throughout the Counties of Down and Antrim, Port- 

 arlington, County of Kildare, and Finnoe, County of Tipperary ; 

 and at Ballantrae, Ayrshire, Scotland. 



6. Vertigo Alpestris, pi. V, f. 15. 



Vertigo Alpestris, Ferussac, MSS. ; Alder, Mag. Zool. and 

 Bot., II, p. 112; Brown, Illust. Conch., p. 42, pi. 18, f. 40. 



Shell subcylindrical, pellucid, of a pale yellowish horn-colour ; 

 spire provided with four somewhat ventricose volutions, gra- 

 dually tapering to a rather obtuse apex ; whole surface covered 

 with longitudinal, minute striae; aperture semicircular, provided 

 with five teeth, one of which is situate on the superior portion 

 of the aperture, two on the columella, and two on the outer lip, 

 which is slightly reflected. Length one-tenth of an inch ; dia- 

 meter half its length. 



Found on old walls, in Northumberland, near Newcastle- 

 upon-Tyne, by Joshua Alder, Esq. 



This species differs from V. pi/gmcea in being slightly striated, 

 and somewhat more cylindrical. 



Section II. — Shell fusiform and sicbct/lindrical; spiral con- 

 volutions sinistral ; aperture eMernally margined. 



7. Vertigo pusilla, pi. V, f. 1(5. 



Vertigo pusilla, Muller, Verm., II, p. 124, No. 320; Alder, 

 Mag. Zool. and Bot., II, p. 112; Jeffreys, Linn. Tr., XVI, p. 

 361 ; Pfeilfer, I, p. 72, pi. 3, f. 45, 46; Thompson, Ann. and 

 Mag. Nat. Hist., VI, p. 41 ; Vertigo heterostropha, Leach, 

 Moll., p. 130; Pupa vertigo, Drapernaud, p. 61, pi. 3, f. 34, 

 35; Jaminea heterostropha, Risso, IV, p. 91 ; Helix vertigo, 

 Gmelin, Linn. Syst. Nat., I, p. 3654, No. 155; Schroter, Fluss- 

 conchyl., S. 349; Vertigo pusilla, Brown, Illust. Conch., p. 42, 

 pi. 18, f. 41. 



Shell ventricose, ovate, brittle; volutions heterostrophe; body 

 and spire about equal in length ; the latter consisting of four 

 somewhat ventricose, nearly transverse volutions, terminating in 

 a rather obtuse apex; aperture subfriangular, oblique, situate 

 on the right side of the shell; provided internally with two 

 teeth on the superior portion of the peristome, two on the 



