AZOREAN GROUP. 15 



larger than, the last species, and has the spire similarly de- 

 pressed, and the spiral whorls traceable (from beneath) up to the 

 apex ; nevertheless it is more rounded in outline, the basal 

 volution being a little more convex both above and below, its 

 surface is somewhat smoother, and its colour is appreciably- 

 deeper or more pronounced. Its aperture, too, is not qidte so 

 elongate or produced, and has its columellary border (which is 

 extremely membraneous) less narrowed. 



Vitrina brevispira. 



Vitrina brevispira, Mo7'eL, Hist. Nat. des Agor. 148, t. 1. 

 f. 6 (1860) 

 „ „ Drouet, Faun. Agor. 146 (1861) 



„ Pfeiff., Mon. Hel. vii. 22 (1876) 



Habitat Sta. Maria, et S. Miguel ; prsecipue, in ilia, ad col- 

 lum Pico Alto vulgaris. 



Judging from the diagnosis and figure, the present Vitrina 

 does not seem to me to differ very materially from the V. 

 brumalis ; and, although Morelet and Drouet mention it as 

 occurring more particularly in Sta. Maria, it is found also (like 

 that species) in S. Miguel. It is, however, apparently, a trifle 

 smaller, and has its spire a little more minute and lateral, as 

 well as composed of half a volution less. The lower border too 

 of its aperture is, if anything, even narrower and straighter ; and 

 its suture is said to be somewhat denticulated. 



Vitrina finitima. 



Vitrina finitima. Morel., Hist. Nat. des Agor. 150. t. 1. f . 7 

 (1860) 

 „ „ Drouet, Faun. Agor. 145 (1861) 



„ „ Pfeiff., Mon. Hel. vii. 22 (1876) 



Habitat Flores ; sub ligno lapidibusque in humiusculis, 

 vulgaris. 



In its size and general contour (the shell measuring about 

 8 millimetres across its broadest part), as well as in the ex- 

 tremely narrow and membraneous lower border of its peristome 

 and the fact of its spiral whorls being visible from beneath up to 

 the extreme apex, the V. finitima is very similar to the 

 brevispira ; nevertheless, apart from its ultimate volution being 

 just appreciably rounder, it may at once be recognised, both 

 from that species and the others, by the right or upper edge of 

 its peristome being a little thickened and even subreflexed, — a 

 structure which is decidedly anomalous in the members of this 

 genus. 



The V. finitima was taken abundantly by M. Drouet in 



