TRUNCATELLINA. 69 



with an oily luster ; nearly smooth, only under the lens show- 

 ing fine, close, hair-like striae,* which become somewhat more 

 distinct immediately preceding the aperture. Whorls 6, 

 rather ventricose, separated by moderately deep suture, the 

 3d to 5th very gradually increasing, the last about y^ to % 

 the total length, somewhat ascending to the aperture. Aper- 

 ture roundish, especially rounded below, as high as wide, the 

 outer margin obtuse-angularly bent inward, somewhat pro- 

 duced forward below the angle, and inclined to be thickened. 

 Columellar margin somewhat expanded and a little reflected 

 towards the round, open umbilicus. Peristome distinctly 

 white-lipped. Length 1%, width y 2 mm. 



"Differs from cylindrica by the smaller size, less obtuse 

 apex, the smoothness and gloss and the somewhat stronger- 

 lipped, more rounded aperture. The general appearance is 

 diverse. Very small full-grown specimens are found, of 

 scarcely 1 mm. length. On weathered specimens the striation 

 is somewhat more distinct. 



"Isthmia laeviuscula appears to be a form of the eastern 

 Alps and Balkans. East of Triest it occurs in Carinthia, in 

 Serbia (v. Moellendorff), in Hungary (Ministal between 

 Steierdorf and Baniaska), finally in Banat, near the Hercules- 

 bade." 



Pfeiffer used the term sublaevigata as part of the descrip- 

 tion of var. 6, Pupa laeviuscula, in the Monographia, ii, 1848, 

 p. 307, but in the Nomenclator, 1878, that term is adopted as 

 a name for Kiister's form. 



7. TRUNCATELLINA ROTHI (Eeinhardt). 



Shell very obtuse (the 3d whorl from above as wide as the 

 following), almost diminishing downwards. Whorls 6, con- 

 vex, little ascending, parted by a pretty deep suture, the 

 embryonic whorl smooth, the rest having sharp, spaced ribs, 

 running from the left above to the right below, the intervals 

 wider than the ribs. The three middle whorls (or at least the 



*Kuester wrote me: "If a distinct species, I would rather call it 

 capillacea." I regret that this excellent name cannot be used for 

 reasons of priority (Eeinhardt). 



