FISHES AND MOLLUSKS OF LAKE CHAUTAUQUA. 175 
MOLLUSKS OF CHAUTAUQUA LAKE. 
No special effort was made to collect the mollusks inhabiting this 
lake, and the following list is therefore far from complete. The little 
collecting that was done was on the northwest and north shores. 
Species of Unionide, especially the heavy-shelled forms, do not 
appear to be very abundant, either as to species or individuals. Cam- 
peloma, Planorbis, Limnea, and Physa seem abundant, and Unio 
gibbosus, Anodonta grandis footiana, and Lampsilis luteolus were the 
most common species of mussels. V2vipara contectoides, which is so 
abundant in many of the small lakes in northern Indiana in the 
Wabash Basin, was not found in Chautauqua Lake. 
For assistance in the identification of the shells we are under obli- 
gations to Mr. Charles T. Simpson, of the Department of Mollusks, 
United States National Museum. 
UNIVALVES. 
. Campeloma decisum Say. Common. 
. Valvata tricarinata Say. Only one specimen obtained. 
. Planorbis trivolvis Say. 
. Planorbis campanulatus Say. 
. Pianorbis bicarinatus Say. Two specimens. 
6. Limneea palustris Mill. Common. 
. Physa ancellaria Say. Common. 
Ol mR 1 WR 
BIVALVES. 
8. Spherium rhomboideum Prime. 
9. Spherium striatinum Lam. 
10. Spherium sulcatum Lam. 
The second and third of the above three species were more common than the 
other. ‘ 
11. Anodonta grandis footiana Lea. 
12. Unio gibbosus Barnes. 
13. Lampsilis luteolus (Lam.). 
14. Strophites undulatus (Barnes). 
15. Strophites edentulus (Say). This may be Strophites wndulatus. 
