76 CAUCASIAN LAURLE. 



Lauria paulimcc Lindholm, Nachrbl. D. Malak. Ges., vol. 45, 

 June 1913, p. 62. — Lauria paulincc Ldh., subsp. unicolumel- 

 laris Lindholm, Nachrbl., vol. 46, 1914, p. 36. 



By having a nearly vertical, semicircular lamella very deep 

 within on the columella, this species appears related to L. 

 caucasica, from which it differs by the folds of the columella. 

 It appears to be quite unlike other known species of the 

 region. 



16a. L. paulince unicolumellaris Lindh. 



This new form is distinguished from the type in that the 

 columella bears only one horizontally placed fold, while in the 

 type two such folds are present. Also, the vertical lamella 

 deep in the interior, on the columella, is not white but brown- 

 ish, and not quite so semicircular as in the type (Lindholm). 



Transcaucasia: Mt. Salolet at Artwin (Gouv. Batum) in 

 beech forest, 5300-5500 ft., two living adult specimens (Lind- 

 holm). 



In size, color, sculpture and thinness of the peristome it 

 agrees with the type, differing only in the armature of the 

 aperture, as noted above (Lindholm) . 



17. Lauria tenuimarginata Boettger, n. sp. PL 10, figs. 1, 2. 

 The shell is perforate, very openly rimate, thin, pale olive- 

 buff with a brown band on the last whorl, appearing above 

 the suture on the penult. The surface has but little gloss and 

 is smooth except for weak, fine growth-lines. The spire is 

 convexly conic. Whorls are moderately convex, the last very 

 slightly impressed in the place of the lower-palatal fold; 

 suture distinctly ascending to the lip. The aperture is irreg- 

 ularly ovate. Angular lamella is very high, oblique, thin, a 

 low callus connecting with the lip-insertion, and penetrating 

 to the dorsal side. Parietal lamella much smaller and shorter. 

 The columellar lamella emerges, slants downward and enters 

 horizontally, penetrating to the ventral side. The lower- 

 palatal fold is thin, moderately high, tapering at both ends, 

 not emerging. There is a low denticulate callus between the 

 low, wide lip-tooth and the lower-palatal. Basal fold very 



