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PAPERS ON ZOOLOGY 159 
8. EH. subrostrata (Say)—Abundant at St. Joseph, Cham- 
paign Co., in quiet, muddy water. Dr. Charles C. Adams also 
found it very plentiful in a small pond, partly dried up, at 
White Heath, Piatt Co. 
GENUS CARUNCULINA Simpson (in Baker), 1898 
9. ©. glans (Lea)—Found only at St. Joseph, Champaign 
Co., about the outlet to a slaughter house. C. parva also occurs 
in this stream but not at this particular place. 
10. C. parva (Barnes)—St. Joseph and Crystal Lake, 
Champaign Co.; Hillery, Vermilion Co. The female shells are 
greatly inflated. The species prefers a muddy bottom, burying 
itself to a depth of several inches; slow streams, and nearly 
always near their sources, are preferred. Quite abundant. 
GENUS OBOVARIA Rafinesque, 1819 
(Subgenus Obovaria s. s.) 
11. O. circulus (Lea)—Hillery, Vermilion Co. It is a 
typical member of the Wabash River Drainage System, and is 
quite abundant. It prefers the deeper waters. 
GENUS TRITOGONIA Agassiz, 1852 
12. TJ. tuberculata (Barnes)—Sangamon River, at White 
Heath and Monticello; very abundant and of large size. It 
lives in water of all depths, preferring a sandy bottom. Musk 
rats do not eat this species frequently because the valves fit 
tightly, and because at the least signs of any intrusion, twber- 
culata closes its valves tightly and keeps them closed for a long 
period. Musk rats prefer other clams, such as are easier to 
open. 
GENUS STROPHITUS Rafinesque, 1820 
13. S. edentulus (Say)—White Heath and Monticello, Piatt 
Co., St. Joseph, Champaign Co. In the larger streams and 
bayous, on muddy bottoms, usually associated with Anodonta 
grandis. 
GENUS ANODONTA Lamarck, 1799 
14. A. grandis (Say)—At all stations in the three counties, 
—in lakes, bayous, and streams, preferring waters devoid of 
current. Muddy bottoms are preferred. Very often the entire 
