158 ILLINOIS ACADEMY OF SCIENCE 
ECOLOGICALLY ANNOTATED LIST OF SPECIES 
CLASS PELECYPODA 
Order Prionodesmacea 
Family Unionide 
GENUS LAMPSILIS Rafinesque, 1820 
Subgenus Lampsilis s. s. 
1. L. multiradiata (Lea)—Reported by Mr. Wm. A. Marsh 
from the “Big Vermilion River.” It prefers muddy or sandy 
bottoms, with only a few feet of water. 
2. L. ventricosa (Barnes)—Found in all three counties,—at 
White Heath, Monticello, Salt Fork, Muncie and Hillery. It is 
a very variable species in color, rays, degree of corpulency and 
thickness of the shell. It prefers muddy bottoms of the larger 
streams, and is frequently associated with ELurynia fasciata 
Raf. At Havana, Ill., on the Illinois River, it is a very com- 
mon clam. 
GENUS EURYNI Rafinesque, 1820 
3. E. anodontoides (Lea)—Found only at Monticello, Piatt 
Co. It is a member of the deeper water fauna, either muddy or 
sandy, bottoms, where it can burrow; often among rocks near 
shores. In the Winter it burrows into the mud. At Havana, 
Ill, it is one of the most abundant clams. 
4. HE. ellipsiformis (Conrad)—Reported by Mr. W. W. 
Calkins from the “Vermilion River.” Its habitat is about the 
same as that of L. multiradiata. 
5. E. lienosa (Conrad)—Reported by Mr. Wm. A. Marsh 
from the “Little Vermilion River.” 
6. H.ligamentina (Lamarck)—Found only once, at Muncie, 
Vermilion Co., on a muddy bottom. 
7. E. fasciata (Rafinesque)—Found in all three counties,— 
White Heath, Monticello, St. Joseph, Muncie and Hillery. Very 
plentiful. It prefers the larger streams and thrives on any 
kind of a bottom. Those on sandy bottoms are thicker-shelled. 
The St. Joseph specimens are quite thin. 
