268. Last whorl expanded toward the aperture so that it is about twice as wide 



as the whorl next to it 269. 



Body whorl scarcely expanded 282. 



269. Interior of shell of a definitely different color from the surface of the 



shell, usually purplish or with a whitish deposit within lip; large 



shells, adults being y^," to 1"; eastern and central states Large Leaf 



Snails 270. 



Interior of shell not noticeably different from the surface of the shell 275. 



270. Height about or less than half the diameter 27 L 

 Height usually considerably more than one-half the diameter 272, 



27 L Spire striate 



Mesomphix suhplanus (Binney) 

 Spire smooth 



Meso?nphix inornatus (Say) 



272. Umbilicus round, about onc'sixth diameter of shell; apex usually worn 



Mesomphix (Omphalina) cupreus (Raf.) 

 Umbilicus narrowed, smaller; apex not normally worn 273. 



273. Aperture scarcely wider than high, purple near columellar area 



Mesomphix (Omphalina) friahilis (Binney) 

 Aperture usually noticeably wider than high 274. 



274. Body whorl with fine spiral lines of fine papillae 



Mesomphix vulgatus Baker 

 Spiral lines on body whorl smooth or obscure 

 Mesomphix perlaevis (Pilsbry) 

 (Mesomphix laevigatus Beck) 



275. Shell glassy-smooth, with flat spire; about ^2'' to %"; northwestern U. S. 



Megoynphix hemphilli (Binney) ' 



Shell glossy to striate; spire low; smaller 276. 



276. Shell glossy, scarcely striate; introduced European species often found 



around buildings and in greenhouses 277. 



Shell regularly striate or grooved; native species 278. 



277. Animal almost black; shell about %"; smelling of garlic 



Oxychilus aUiarius (Miller) 

 Animal gray; shell about Yg' 



Oxychilus cellarius (Miiller) Cellar Snail 



278. With seven whorls; northeastern U. S. 



Retinella sculptilis (Bland) 

 With four to five whorls 279. 



279. Umbilicus very minute; eastern and central states 



Retinella indentata (Say) Large-mouthed Leaf Snail 

 Umbilicus small 280. 



280. With five whorls; central states 



Retinella wheatleyi (Bland) 

 With four whorls 281. 



28 1 . Radial grooves extending on base of shell; eastern states 



Retinella rhoadsi (Pilsbry) 



144 



