256. With seven whorls; young (only) with teeth within body whorl; about 



yij"; Virginia and Kentucky 

 Paravitrea pontis Baker 

 With five to six whorls 257. 



257. Lip usually continuing as a thin callus across the parietal wall 258. 

 Not so 261. 



258. Shell light yellowish 259. 

 Shell darker 260. 



259. Lip sinuous, usually indented above and slightly expanded below; whorls 



striate within umbilicus; V'2'' to V/'; eastern and central states 



Haplotrema concavum (Say) Thin-lipped or White Wood Snail 

 (Circinaria concava (Say) ) 

 Lip not so; shell smooth within umbilicus; about Yg"; Wash, and Oregon 

 Megomphix hemphilli (Binney) 



260. Lip usually sinuous above and thickened below; shell dark greenish, with 



light streaks; about Y/' to 1"; Cal. to Wash, and Idaho 



Haplotrema vancouverense (Lea) Vancouver Wood Snail 

 Lip not so; shell ver>' dark brown; about 1%'' to lYi"', Cal. 

 Glyptostoma newherryanum (Binney) 



26 L Shell definitely much lighter colored below than above; about Ys'^'^' ^^ 

 introduced European species 



Oxych\lus draparnaldi (Beck) 

 Shell more uniformly colored; smaller 262. 



262. Young specimens toothed within body whorl; adults darkish horn col' 



ored; about 3/16"; Tenn. 



Pilshryna castanea Baker 

 Body whorl not toothed within; usually light horn colored or pink tinted 



263. 



263. Adults V^"; shells light or pink tinted; Tenn. to Arkansas 



Paravitrea petrophila (Bland) 

 Adults about 3/16" 264. 



264. Pinkish; Virginia 



Retmella virgm-ica Morrison 

 Horn colored; central states 



Retmella wheatleyi (Bland) 



265. With tvv'o to three whorls 266. 

 With four or more whorls 268. 



266. With a small umbilicus; shell heliciform; about Vs"; northeastern and 



north-central states to N. C. 

 Stnatura ferrea Morse 

 No umbilicus; last whorl greatly expanded; larger 267. 



267. Shell darkish; adults about %"; Great Smokies 



VitriyiizonUes laUssimus (Lewis) 

 Shell light; adults about %^'; northeastern states 

 Vitrina Umpida Gould Glass Snail 



143 



