20 HELIX. 



Yar. PALLIDA, Baudon. 



Whitish, the yellowish flammules faint. 



Yar. SCALARIS, Fer. 



Whorls exserted. A monstrosity. 



Yar. GLOBOSA, Fried. 



H. PERSPECTIVA, Say. PL 3, figs. 77-79. 



Widely, perspectively umbilicated, very slightty convex 

 above, excavated below, thin, reddish corneous, regularly 

 costulate ; whorls 6J, slightly convex, slowly increasing. 



Diam. 8 mill. 



U. S. (Middle, Western and Southern States). 



North of Maryland it does not occur east of the Appalachian 

 chain. 



It is Helix patula, Desh. 



H. RUDERATA, Studer. PI. 3, figs. 80-84. 



Perspectively umbilicated, depressed, yellowish corneous, 

 finely costulate-striate, spire a little convex; whorls 4-5, the 

 last with rounded periphery. Diam. 6-8 mill. 



Northern and Middle Europe, United States, Northern Asia. 



The synonyms are : H. rotundata ft Nilss ; H. umbilicus, 

 Marklin; H.striatella, Anthony (figs. 82-84); H.perspectiva^'Fer. 



Yar. ALBIDA, Westerl. 



Shell greenish white. Northern Sweden, Norway. 



Yar. GORTSCHANA, Mousson. 



A little more depressed, thin, costulse not so close and less 



distinct. 



Russian Transcaucasia. 



Yar. OPULENS, Westerl und. 



Globosely convex, densely costulate, widely concavely um- 

 bilicated ; whorls convex, the last obtusely angulated, suture 



deep. Diam. 7, alt. 5 mill. 



Behring^s Island. 

 H. PAUPER, Gould. PI. 3, figs. 85, 86. 



Discoidal, reddish brown, incremental stria} costulate ; whorls 

 4J, a little convex, with deep suture. Diam. 7 '5 mill. 



Kamtschatka ; Jesso, Japan. 

 Umbilicus narrower than in H. ruderata ; but certainly very 



