EUROPEAN SPECIES OF VERTIGO. 211 



independently, so that Vertilla, as used by Boettger, Wester- 

 lund and others is heterogeneous. The name may properly 

 be restricted to V. angustior and its immediate relatives. 



81. VERTIGO ANGUSTIOR Jeffreys. PL 5, figs. 13, 16-18. 



Shell subfusiform or barrel-shaped, narrower in proportion 

 than V. pusilla, rather solid, but semitranspareiit, glossy, light 

 horn-colour, strongly, obliquely and rather closely striate in the 

 line of growth ; periphery compressed and somewhat angular : 

 epidermis thin : whorls 4y 2 , rather convex, but compressed, 

 gradually increasing in size, the penultimate one a trifle 

 broader than the last, which occupies about two-fifths of the 

 shell, the first or upper whorl smooth and shining: spire 

 rather short, abrupt, and blunt at the point : suture rather 

 deep, mouth subtriangular, and very narrow in consequence 

 of the great contraction or sinuosity of the outer edge in the 

 middle as well as towards the base ; teeth four or five, viz. two 

 on the pillar [parietal wall], the outer one of which is a little 

 in advance of the other; one on the pillar lip [columella], 

 which is sunk deep within the mouth and resembles a strong 

 curved plate more than a tooth ; and one thick and promi- 

 nent tooth inside the outer lip, with rarely a small tubercle by 

 the side of it. Outer lip exceedingly thick and scarcely in- 

 flected, strengthened outside and inside by a strong rib which 

 is situate near the rim and is yellowish- white ; the inside rib 

 remarkably thick and increasing the contraction of the mouth ; 

 inner lip consisting of a slight deposit on the columella. 

 Umbilicus very small, narrow and indistinct, being much con- 

 tracted by a sharp and gibbous keel or crest at the base of the 

 shell. L. 0.06. B. 0.035 inch (Jeffreys}. 



Vertigo angustior JEFFREYS, Trans. Linn. Soc. London xvi, 

 pt. 2, 1830, p. 361 (rejectamenta of a small stream at Marino, 

 near Swansea) ; British Conchology i, p. 265. STEENBERG, 

 Danmarks Fauna, Landsnegle, 1911, p. 166, f. 137. Pupa 

 angustior Jeffr., PFEIFFER, Monogr. iii, 560 ; iv, 686 ; vi, 336. 

 WESTERLUND, Fauna Europaea Moll. Extramar. Prodr. ii, 

 1878, p. 200, with var. producta and gothorum, p. 201 ; Fauna 

 iii, p. 142, with var. nana Mich., producta W., gothorum W. 



