MICHIGAN ACADEMY OF SCIENCE. 
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Obovciria circula (Lea). 
ellipsis (Lea). 
leibii (Lea). 
lens (Lea). 
Plagiola cion aci form is ( Lea ) . 
elegans (Lea). 
Obliquaria reflexa Raf. 
Ptychobranchus phaseolus (Hild.). 
Strophitus edentulus (Say). 
pavonia (Lea.). 
rhomb tea (Anth.). 
Anodonta corpulenta Coop. 
grandis Say. 
benediotensis Lea. 
footiana Lea. 
gigantea Lea. 
imbecilis Say. 
kennicottii Lea. 
marginata Say. 
subgibbosa Anth. 
Anodontoides feriissaciana (Lea). 
modesta (Lea). 
subcylinclracea (Lea) . 
Sympliynota complanata (Bar.). 
compressa Lea. 
costata (Raf). 
Alasmidonta calceola (Lea). 
marginata (Say). 
varicosa (Lam.) 
Hemilastena ambigua (Say). 
TJnio complanatus (Dill.). 
gibbosus Bar. 
Quadrula coccinea (Con.). 
kirtlandiana ( Lea . ) 
1 a cli rym o sa ( Lea ) . 
plicata (Say). 
pustulosci (Lea). 
rubiginosa (Lea). 
tuberculata (Raf.). 
undata (Bar.). 
undulata (Bar.). 
hippopea (Lea). 
8 ph cerium aureum (Pme.). 
crassum Sterki. 
emarginatum (Pine.) . 
fabaie (Pine.). 
fkvvum (Pine.). 
lineatum Sterki. 
oecicleiUale Pme. 
rhom boicleum ( Say ) . 
simile (Say). 
solidulum (Pme.). 
