NATURAL SCIENCES OF PHILADELPHIA. 241 



VlTRINA EXILIS, Morcl. 



Petropaulouski, W. H. Dall. The species is also found in 

 Alaska. 



Jaw and lingual membrane as usual in the genus, the former 

 with ends somewhat recurved as in our figure of Zonites arboreus 

 (1. c. p. 33). About seven lateral teeth. 



Helix MooREANA, W. G. Binney. (Polygyra.) 



Bosque County, Texas. Mr. Hugo W. Ericsson. 



Jaw^ with about fifteen, adjoining, broad ribs, denticulating 

 either margin. 



Lingual membrane as in Polygyy^a} 



Helix Hazaedi, Bland, {Polygyra.) 



Munroe Co., Tennessee, Miss Annie E. Law. 



Jaw as usual in Folygyra, ribs adjoining, stout, denticulating 

 either margin. 



Lingual membrane as in H. auriculata (see our fig. 1. c). 



Helix auriformis, Bland. {Polygyra.) 

 Savannah, Georgia. 



Jaw with ribs as usual in the subgenus — see last species. 

 Lingual membrane as usual in the subgenus. (See H. 3fooreana^ 

 above.) 



Helix hirsuta, Say. (Stenotnma.) 

 New Jersey, T. Bland. 



Jaw as usual in the subgenus.^ Lingual membrane already de- 

 scribed by us. (1. c. p. 119, fig. 197.) 



Helix spinosa, Lea. (Stenotrema.) 



Philadelphia, Munroe Co., Tenn. Miss Annie E. Law. 



Jaw as usual in Stenotrema.^ 



Lingual membrane as usual in the subgenus.'^ 



Helix RuGELi, Shuttleworth. {Triodopsis.) 



Philadelphia, Munroe Co., Tenn. Miss Annie E. Law. 



1 See our figures 1. c. p. 87 and 92. 



2 The jaw in Stenotrema is arcuate, ends blunt, anterior surface with 

 crowded, broad ribs, denticulating either margin. See our figure of the 

 jaw oill. monodon^ 1. c. p. 122, fig. 204. For lingual membrane, see fig. 

 205. 



