152 ZON1TES. 



H. NITIDULA, Drap. PI. 49, figs. 84-86. 



Widely umbilicated, globosely depressed, rather smooth, orange- 

 ^ ^ brown above, whitish below, slightly shining; whorls 4^, the 

 last dilated in front. Diam. 9 mill. 



Europe. 



H. nitida, Friele,is a synonym, and H. lucens, Pult., and //. 

 Helmii , Gilb., are slight varieties. 



II. SIMPLICULA, Morelet. PL 49, figs. 87-89. 



Moderately umbilicated, thin, striulate, scarcely shining, 

 diaphanous, light corneous, whitish below; whorls 5, slowly 

 enlarging, the last subangulated above, suture deeply impressed, 

 columellar margin of aperture very short. Diam. 6*6 mill. 



Portugal. 

 II. JACCETANICA, Bourg. PL 49, figs. 90-92. 



Subperviously narrowly umbilicated, depressed, convex above, 

 shining, fragile, pellucid, corneous, striulate above, more or less 

 smooth below ; whorls 5, slowly increasing, suture well impressed, 

 last whorl scarcely larger, rounded below. Diam. 5'25 mill. 



Montserrat, Catalonia. 



Is perhaps a var. of H.petronella, Charp. 



II. PURA, Alder. PL 49, figs. 93-97. 



Moderately umbilicated, depressed, ashy-white to light corne- 

 ous, crystalline, lightly striate, ve^ obscurely so except at the 

 suture; whorls 4, rapidly enlarging, suture moderate. 



Diam. 3-4 mill. 





With this species has been confounded the following one as 

 well as several of its synonyms. 



Yar. LENTICULA, Held. (Figs. 95-97 ) Shell corneous. 

 H. RADIATULA, Alder. PL 49, figs. 98-100. 



Moderately umbilicated, depressed, pellucid, shining, closely 

 lightly striulate, corneous ; whorls 4, rapidly enlarging, the hist 

 depressed, suture submargined. Diam. 4-5 mill. 



Circumpolar, Europe, Northern Asia, North 



America from Oregon and Great Slave Lake 



to the Gulf of Mexico. 



One of the commonest species of middle Europe and the 

 United States. It has been confounded with the preceding, but 



