EUROPEAN SPECIES OF VERTIGO. 185 



rowed at base, 4-plicate : 1 lamelliform parietal, 1 dentiform, 

 deeply placed columellar and 2 palatals, the upper one emerg- 

 ing, dentiform, the lower immersed, lamelliform. Peristome 

 white lipped within, expanded especially on the basal and 

 columellar margins. Outer lip sinuous and anteriorly arcu- 

 ate, having a little sulcus at the periphery; the lip margins 

 united by a rather strong callus. Length 2^, diam. 2 mm. 

 (Bgt.). 



Algeria : alluvium of the Oued Mazafran and the Harrach, 

 near Algiers. 



Vertigo codia BGT., Malac. Algerie ii, 1864, p. 103, pi. 6, 

 f. 39-41. 



Vertigo codia differs from V. aprica by the globulose form, 

 ventricose, not oblong, by the much more rapid increase, the 

 far more swollen penult whorl, smaller, more tapering last 

 whorl, the triangular aperture, etc. (Bgt.). 



59. VERTIGO BRIOBIA Bourguignat. 



Shell very minute, rimate, oblong, glossy, subpellucid, 

 smooth, corneous ; spire obtusely tapering, apex obtuse. 

 Whorls 5, a little convex, regularly increasing, separated by 

 an impressed suture, the last somewhat compressed basally, 

 straightened at the aperture. Aperture slightly oblique, a 

 little lunate, oblong-subtrigonal, 4-plicate; 1 lamelliform 

 parietal, 1 dentiform columellar and 2 palatals, the lower 

 stronger. Peristome straight, acute, white-lipped within, 

 lightly expanded at the columellar margin, and outside en- 

 circled with a paler lip [crest], swollen below; margins 

 joined by a callus. Length 2, diam. 1 mm. (Bgt.). 



Algeria : debris of the Harrach near Algiers. 



Vertigo briobia BGT., Malac. de 1'Algerie ii, 1864, p. 313. 



60. VERTIGO MICROLENA Bourguignat. PL 16, fig. 13. 



Shell rimate, very minute, oblong-globose, glossy, subpel- 

 lucid, corneous, smooth ; spire obtusely tapering, the apex 

 minute, paler. Whorls 5, convex, rather rapidly increasing, 

 separated by an impressed suture, the last slightly larger, 

 tapering, somewhat flattened at the periphery behind the 



