NATURAL SCIENCES OP PHILADELPHIA. 241 



VlTRINA EXILIS, Morel. 



Petropaulouski, W. 11. 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 arhoreus 

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



Helix MooREANA, W. G. Binney. {Polycjyra.) 



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



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

 either margin. 



Lingual membrane as in Pohjgyra} 



Helix Hazardi, Bland. {Polygyra.) 



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



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

 either margin. 



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



Helix auriforjiis, Bland. (Polygym.) 

 Savannah, Georgia. 



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

 Lingual membrane as usual in the subgenus. (See H. Ilooreana, 

 above.) 



Helix hirsuta, Say. (Stenotrema.) 

 New Jersc}', 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 EuGELi, Shuttleworth. (,Tviodopsis.) 



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



' See our figures 1. c. p. 87 and 93. 



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

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

 jaw of //. monodon, 1. c. p. 122, fig. 204. For lingual membrane, see fig. 

 205. 



