MICHIGAN ACADEMY OP SCIENCE. 
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128 . 
129. 
130. 
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132. 
133. 
134. 
135. 
13G. 
137. 
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140. 
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142. 
143. 
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14G. 
147. 
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159. 
Aplexa hyp norum (L.) . 
glabra (DeKay). 
tryoni (Curr.). 
sp.? 
Planorbis bicarinatus Say. 
aroostookensis Pi Is. 
corrugatus Curr. 
percarinatus Walker. 
portagensis Baker. 
royalensis Walker. 
striatus Baker. 
campanulatus Say. 
minor Dkr. 
rudentis Dali. 
corpulentus Say. 
crista L. 
deflectus Say. 
exacuous Say. 
hirsutus Gld. 
multivolvis Case. 
parvus Say. 
lualkeri Van. 
trivolvis Say. 
binneyi Try on. 
truncatus Miles. 
umbilicatellus Ckll. 
Segmentina armigcra (Say). 
crassilabris Walker. 
Ancylus fuscus C. B. Ads. 
eugraptus Pi Is. 
kirklandi Walker. 
parallelus Hald. 
rivularis Say. 
shimekii Pils. 
tardus Say. 
walkeri P. & F. 
Valvata bicarinata connectans Walker. 
perdepressa Walker. 
lewisii Curr. 
sine era Say. 
nylanderi Dali. 
tricarinata Say. 
confusa Walker. 
simplex Gld. 
unicari na ta DeKay. 
Vivipara contectoides W. G. Binn. 
Campeloma decisa (Say). 
flava Curr. Mss. 
melanostoma Curr. Mss. 
in tegra (Say). 
miles ii (Lea). 
obesa (Lewis). 
