MICHIGAN ACADEMY OF SCIENCE. 
121 
A CHECK LIST OF MICHIGAN MOLLUSCA. 
BRYANT WALKER. 
PREFACE. 
The last general catalogue of the mollusca of the state was published 
in 1884. During the seventeen years that have elapsed sinee that time, 
not only has the number of species known to inhabit the state been 
largely increased, but the advance in systematic concliology lias resulted 
in many changes in classification and specific nomemiclature. 
The constantly increasing size of the known fauna of the state is 
shown by the following summary of the several general catalogues that 
have been published since the first, in 1839. All synonyms and obviously 
erroneous citations have been omitted and the comparison is based on 
the accepted nomenclature of the present time. 
Name. 
Date. 
Land. 
Fresh Water 
Pulmonates. 
Fresh Water 
Operculates. 
Bivalves. 
Total. 
Sager 
1839 
23 
10 
4 
26 
63 
Miles 
1860 
44 
24 
14 
48 
130 
Currier 
1868 
44 
34 
12 
52 
142 
DeCamp 
1881 
48 
38 
23 
68 
177 
Walker 
1894 
71 
51 
31 
81 
234 
Walker 
1911 
83 
67 
33 
ns 
301 
In view of these facts, it has seemed probable that a check-list, 
brought down to date, might be of service to those interested in our 
local fauna. 
Detroit, March 1, 1911. 
check-list. 
1. Acanthinula Jiarpa (Say). 
2. Vallonia costata (Mull.). 
3. excentrica Sterki. 
4. pulchella (Mull.). 
5. Polygyra albolabris (Sav). 
tleutata (Try on.). 
maritime Pils. 
6. 
clausa (Say). 
7. 
elevata (Say). 
8. 
fraudulent a Pils. 
9. 
fraterna (Say). 
10. 
Mrs u,t a (Say). 
11. 
inflect a (Say). 
12. 
mitchelliana (Lea 
13. 
monodon (Rack.). 
