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. STRTATA, 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 subi rubricated 

 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. 



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

 the umbilical region less impressed, olivaceous brown or green- 

 ish, whorls 3J, 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. PL 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, 

 Innately 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. PL 31, figs. 67, 68. 



Lightly rimate, subturbinate, 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 



