CAUCASIAN LAURLE. 77 



small, immersed. Peristome expanded, rather thin. Length 

 2.8, diam. above aperture 1.6 mm. ; 7% whorls. 



Transcaucasia: Nolanebi. Type 130116 A. N. S. P., from 

 the Boettger coll. 



A second specimen (pi. 10, fig. 2) has scarcely any callus 

 between angular lamella and lip-insertion, and there is only a 

 smooth callus between the lip-tooth and the outer end of the 

 lower-palatal fold — where the type has two denticles upon the 

 callus. As in this specimen the peristome is less calloused 

 within, it may not be absolutely mature. 



This species is rather isolated among Caucasian Laurie. 

 The smooth surface, rather thin lip, horizontally entering 

 columellar lamella and small size are strikingly like the Ma- 

 deiran group of L. cheilogona or the Azorean L. fuscidula. 

 The resemblance to L. vincta Lowe is astonishing, general 

 shape, color and teeth being nearly alike; but the Transcau- 

 casian species differs by having more whorls in a smaller 

 shell, there is an upper-palatal callus or denticles where vincta 

 has none, and the lower tooth of the aperture is truly basal, 

 whereas in vincta it is subcolumellar in position. 



I have been unable to find Boettger 's description of this 

 species, if any was published. 



18. Lauria superstructa (Mouss.). PI. 9, figs. 1, 2, 3, 4. 



Shell perforate-rimate, obtusely cylindric, well striated ob- 

 liquely, a little glossy, pale corneous. Spire ovate-conic, the 

 summit shortly conic, minute ; suture slightly impressed. 

 Eight whorls are closely coiled, the first a little convex, the 

 rest flattened, the sixth largest, the last tapering, ascending 

 in front, rounded, slightly compressed at the perforation. 

 Aperture exactly vertical, one-third the length, broadly trun- 

 cate-semioval, much contracted. Peristome strongly reflected, 

 somewhat doubled, having a thick callus built up within; 

 margins remote, joined by a thin layer, the right and colu- 

 mellar subparallel, basal curved. Folds 5, the 1st and 2d on 

 the parietal wall, the latter median, deeply placed, the first 

 lateral, stronger, joined to the margin by a sinuate callus; 

 3d and 4th on the columella, the lower one stronger ; 5th com- 



