EUROPEAN SPECIES OP 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. PI. 5, figs. 13, 16-18. 



Shell subfusiform or barrel-shaped, narrower in proportion 

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

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

 line of growth ; periphery compressed and somewhat angular : 

 epidermis thin: whorls 4%, 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. product a and gothorum, p. 201 ; Fauna 

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



