172 HELIX-HELICELLA. 



minute, hardly obtuse, composed of 1? dark-corneous smooth whorls. 

 Whorls 5 or 5i, rather slowly increasing until the last, which is 

 much wider and rapidly increases ; at its origin the last whorl is dis- 

 tinctly angular above its middle, the angle becoming less prominent 

 on the last third of the whorl; toward the aperture, the suture 

 descends below the peripheral angle. Aperture nearly circular 

 except for the segment (slightly less than a fourth) cut from it by 

 the parietal wall ; the upper lip is usually somewhat straightened also. 

 The peristome is thin, fragile, but strengthened a short distance 

 within by a narrow but strong brown (or white) rib. 

 Alt. 7, diam. 12 mill. 



Lyons and Marseilles, France. 



H. trepidula SERVAIN, in COUTAGNE, Faune malac. du basin du 

 Rhone, p. 12. WESTERL., Fauna palsearct. Binnenconch. ii, p. 268. 

 KOBELT, Rossm. Icon. n. f. iv, p. 93, f. 705. 



This species may be known by the angular body-whorl and saffron, 

 brown lip-rib. The specimens before me, received from Locard, 

 show rather a wide range of variation in coloring. Some are dis- 

 tinctly banded with translucent brown, and others show a black- 

 brown peripheral band, with several narrower bands of the same on 

 the latter half of the base. The columellar lip is unusually well 

 rounded and expanded. 



H. JACHNOI Clessin. PI. 44, figs. 96, 97, 98. 



Shell broadly umbilicated, strong, depressed, strongly striated, 

 chalky-white, unicolored or with only weakly indicated bands. 

 Whorls 5i, slowly and regularly increasing, cylindrical, separated 

 by a deep umbilicus ; the last whorl scarcely double as wide as the 

 preceding, hardly deflexed. Aperture circular, but little modified 

 by the penultimate whorl ; peristome sharp, straight, with a white 

 lip within, margins not approaching. 



Alt. 7, diam. 16 mill. (Cless.*) 



Galicia. 



H. instabilis Ziegl. in ROSSM., Icon., f. 518. H. jachnoi CLESS., 

 Moll.-Fauna Oesterreich-Ungarnsu. Schweiz, p. 183, fig. 88, 1887. 

 var. bakowskiana CLESS. /. c., f. 89. H. instabilis var. bakowskiana 

 CLESS., Mai. Bl. 1879, p. 9, t. 1, f. 6. BAKOW. Miezcaki zebr. na 

 Podulu 1879, p. 5, t. 1, f. 8, a, b. 



This species is separated from H. instabilis by the very convex 

 whorls, deeper suture, and slower, more regular increase of the 



