species and individuals, the following appearing in addition to 

 the species noted above : 



The deeper woods furnish a larger number of species, as might 

 be expected. They include all the border forms mentioned, and 

 a number of additional species which are listed in the first col- 

 umn of the table. 



The distribution of the species occurring in borders and woods 

 is usually quite local. On dewy mornings^ or during and after 

 rains, they may be found creeping upon various herbaceous 

 plants, or in some cases upon the bark of living tree-trunks. 

 One of the most abundant species occurring on tree trunks is 

 Bifidaria corticaria, which is most frequent upon the red elm, 

 but also occurs on green ash, bur oak, and other trees. Dr. T. C. 

 Stephens, Mr. Glenn I. Tenney and the writer collected numer- 

 ous specimens in such locations on rainy days. With them were 

 found a few specimens of Yallonia graciUcosta, Y. parvida, Bi- 

 fidaria holzingeri^ Zonitoides arhoreus and Pyramidula striatella. 



In dry weather these terrestrial forms are found in great 

 abundance under fallen leaves of trees, and any fairly well pro- 

 tected bank or slope on which the leaf mulch has not been dis- 

 turbed is sure to yield a number of species. Most of these species 

 may also be found under logs and sticks, and in and about rotten 

 stumps. 



Quite frequently dead specimens of both terrestrial and aquatic 

 forms are thrown upon the beaches with finer drifted materials, 

 and often an opportunity is thus presented to gain a ready 

 knowledge of the local molluscan fauna. Extensive lacustrine 

 deposits in Upper Gar lake and in the swamp south of Miller's 

 Bay also offered fine opportunities for learning something of the 

 earlier fauna of the region at the time that the canals were being 

 excavated. 



Some conception of the several faunas mentioned may be ob- 

 tained from the accompanying table, in which type habitats 

 within our area, rather than specific localities, are indicated. 

 The following symbols are employed in the table : 

 1. — As in the botanical tables, Roman numerals are employed 



Zonitoides arbor eus 

 Vitrea hammonis 

 Helicodiscus parallelus 



Cochlicopa lubrica 

 Euconidiis fulvus 

 Siiccinea avara 



71 



