154 VERTIGO OF JAPAN AND EASTERN ASIA. 



ovate, with 4 or 5 white teeth: parietal lamella moderately 

 developed; columellar lamella directed downward, ascending 

 a little within; two well developed palatal folds, the lower 

 longer; a small basal fold (but wanting in some examples). 

 There is a distinct whitish palatal callus. The outer lip 

 is straightened in the middle but not inflexed; lower part 

 of the peristome is expanded. 



Length 1.8, diam. 1.1 mm. ; barely 5 whorls (type, figs. 8, 10) . 



Length 1.75, diam. 1 mm. (fig. 9). 



Japan : Akkeshi, Kushiro, in northeastern Yesso, Y. Hirase. 

 Type and paratype no. 90223 A. N. S. P. 



Vertigo hirasei kushiroensis PILSBRY & HIRASE, Proc. A. 

 N. S. Phila., 1905, p. 718. 



This species differs from V. hydrophila by having no angu- 

 lar lamella; from V. hirasei by the development of a strong 

 crest, as well as by the stronger, darker shell. 



38. VERTIGO HIRASEI Pils. PI. 14, figs. 13, 14. 



The shell is rimate, cylindric-ovate, ochraceous-buff, im- 

 perfectly transparent, thin. Surface glossy, with faint traces 

 of striae, becoming finely more distinctly striate a short dis- 

 tance behind the lip. The summit is very obtuse. Whorls 

 are rather weakly convex, the last not compressed below, with- 

 out external impressions or crest. The aperture is ovate, 

 having 4 small teeth: the parietal lamella is oblique, about 

 0.2 mm. long; columellar lamella short, ascending a little in- 

 wardly. Lower palatal fold short, but longer and more im- 

 mersed than the very small upper palatal. There is no trace 

 of a palatal callus. The peristome is thin, strongly arched 

 above, straightened in the middle; it is very slightly ex- 

 panded in the lower part. In profile view (fig. 14) it is 

 seen to bend well forward in a rounded lobe above the middle 

 of the outer margin. Length 1.65, diam. 1 mm. ; fully 4% 

 whorls. 



Japan: Yanagawa, Chikugo, in Kiushiu, Y. Hirase. Type 

 and paratypes no. 79738 A. N. S. P. 



Vertigo hirasei PILSBRY, Nautilus xiv, March, 1901, p. 128 ; 

 Proc. A. N. S. Phila., 1901, p. 484, pi. 28, f. 53. Vertigo 



