VITRINA. 141 



margined ; whorls 3, rapidly increasing, the last broad and 

 flattened below ; aperture obliquely oval, the termination of the 

 peristome membraneous, that of the columella slightly reflected, 

 giving the appearance of a punctiform perforation. 

 Diam. 7-5, alt. 3 mill. 



Kamtschatka, Alaska. 



y. STRIATA, Bourg. Unfigured. Ste. Baume, France. 



Section GALLANDIA, Bourg., 1880. 



Y. LEDERI, Bottger. PI. 31, figs. 62, 63. 



Umbilical region profoundly impressed, imperforate, rimate, 

 shell depressed conical, very thin, fragile, pellucid, brownish 

 yellow ; whorls 3, rather rapidly increasing, with a subimbricated 

 carina on the periphery of the last whorl, surface distinctly 

 striate-costulate, smoother and more shining below. 



Diam. 5, alt. 2'75 mill. Caucasus. 



y. SUBCARINATA, Bottger. 



Unfigured. Differs from V. Lederi in being larger, not rimate, 

 the umbilical region less impressed, olivaceous brown or green- 

 ish, whorls 3^, a little more convex, not imbricated at the carina, 

 which is less acute, the striae denser and finer. 



Diam. 5*75, alt. 4 mill. 



Talytsch, Caspian Region. 



y. CONOTDEA, Martens. PI. 31, figs. 64-66. 



Rimate, turbinate, rugosely striated, shining, olivaceous with 

 a lighter suture, spire elevated; whorls 3^, regularly increasing, 

 somewhat convex, the last subdepressed, planulate below, 

 scarcely angulate at the periphery ; aperture somewhat oblique, 

 lunately rounded, the margins subapproximate, joined by a thin 

 callus, columellar margin arcuate, very shortly reflected. 



Diam. 4'5, alt. 4 mill. 



Turkestan. 

 y. SUBCONICA, Bottger. PI. 31, figs. 67, 68. 



Lightly rimate, subturbfnate, very thin, pellucid, light oli- 

 vaceous brown ; spire elevated, the apex small, excentric, mamil- 

 iary ; whorls 3, regularly finely striated, striae stronger at the 

 sutures, the periphery scarcely subangulated ; aperture obliquely 



