214 A NATURALIST IN THE GREAT LAKES REGION 



characteristic inhabitants, such as the common mole (Fig. 286) ; 

 the common or long-tailed shrew, similar to the short-tailed 

 (Fig. 425), but the former is only 4 inches long, the tail making 

 1.5 inches of that length; the latter is 5 inches long and the tail 

 is only i inch or less; and the white-footed deer mouse (Fig. 287). 

 Under and in the old logs in various stages of decay are found a 

 host of snails. Indeed, this moist forest is the favorite haunt 

 of the land snails and slugs, Polygyra albolabris, fraudulenta, 



hirsuta, inflecta, mono- 

 don, oppressa, palliata, 

 are abundant as are also 

 Pyramidula alternata, 

 perspective,, and solitaria, 

 Omphalina fuliginosa 

 and friabilis, Zonitoides 

 arboreus. Circinaria 

 concava is common, a 

 carnivorous form that 

 feeds on other land snails 

 (Figs. 284, 285). In 

 moist weather all these 

 kinds may be found 

 traveling over the leaves 

 upon the ground, old 



FIG. 283. Bracken fern, Pteris aquilmis . . 



logs, shrubs, and tree 



trunks. In drier weather they are in hiding under logs and 

 stumps. The Polygyras are all land snails distinguished by the 

 fact that the edge of the opening of the shell is reflected in a 

 broad lip. P. fraudulenta and P. inflecta have two projections 

 called " teeth" on the lip of the opening, one on the body wall 

 (parietal tooth). The former has an open umbilicus at the 

 base of the spire, the latter has none. P. monodon, P. hirsuta, 

 and P. fraterna are small, one-half inch or less in diameter. The 

 lip is notched in hirsuta, and the shell is covered with short dense 

 hair. P. fraterna is similarly hairy, but the lip is not notched. 



