The Terrestrial Mollusca of Michigan. 
This paper is based mainly upon the records accumulated 
by the Conchological Section of the Academy. All other 
available sources of information, however, have been utilized, 
and it therefore represents substantially everything that is 
known at the present time in regard to the extent and distri- 
bution of this portion of the fauna of the state. 
In the catalogue of the mollusca of the state, which was 
presented at the first meeting of the Academy in 1894, it was 
shown that up to that time seventy-five species of terrestrial 
mollusca had been cited from Michigan. Of these four spe- 
cies and one variety, viz: 
Helix virgata, DeCosta. Succinea campestris Say. 
Polyeyra clausa (Say). Fs ovalis higginsi Bld. 
Ss z od 
Pupa decora Gld. 
were deemed of too doubtful occurrence to be recognized 
unequivocally as members of our fauna. The remaining 
seventy-one species were then considered to be sufficiently 
established as inhabitants of the state and were so cata- 
logued. Since the publication of that paper the work of com- 
piling the census has been undertaken and completed. Spe- 
cial attention has been given to the authentication of the 
occurrence of every species heretofore quoted from the state, 
and, with but one or two exceptions, this has been satisfac- 
torily accomplished. As the result of these investigations, 
one species, then considered as doubtful, (Polygvra clausa) 
has been authenticated, and for reasons stated at length in 
the accompanying annotated catalogue, three other species 
and two varieties must be erased for the present, at least, 
from our faunal list. They are: 
Omphalina tnornata (Say.) Polyeyra thyroides bucculenta 
Zonitotdes limatulus (Ward). (Gld). 
Succinea aurea Lea. as palliata alba 
(Currier ). 
