Castor fiber—Beaver.
Ondatra Zibethicus—Musk-rat.
Gerbillus Canadensis—Leaping-mouse.
Arctomys monax—Maryland marmot.
Mus agrarius?—Rustic mouse.
Arvicola Zanthognatha, Leach—Meadow mouse (on the Ohio).
{262} Mus musculus—introduced by our expedition.
Pseudostoma bursaria—Pouched rat.
Sciurus cinereus—Gray squirrel.
—— capistratus—White-nosed do.