266 ' REPORT OF THE FOREST, FISH AND GAME COMMISSION. 



AollQ3l^s of CI)aQtaQ(j:Qa I^al^e. 



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 Unionidae, especially the heavy-shelled forms, do not appear to be 

 very abundant, either as to species or individuals. Cainpeloma, Planorbis, Liinncea, 

 and Pliysa seem abundant; and Unio gibbosiis, Aitodonta grandis footiana and Lantp- 

 silis biteoliLS were the most common species of mussels. 



Vivipara contectoidcs, 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 obligations to Mr. 

 Charles T. Simpson, of the Department of Mollusks, United States National 

 Museum. 



Fresh Water Univalves. 



1. Campeloma decisum Say. Common. 



2. Valvata tricarinata Say. Only one specimen obtained. 



3. Planorbis trivolvis Say. 



4. P. campanulatus Say. 



5. P. bicariiiatus Say. Two specimens. 



6. Liinnaa palustris Mull. Common. 



7. Pliysa ancellaria Say. Common. 



Fresei Water Bivalves. 



8. Splia;riiiin rJiomboidcnin Prime. 



9. 5. striatimun Lam. 



10. S. sulcatum Lam. The second and third of these three species were more 

 common than the other. 



11. A nodonta gi'andis footiana Lea. 



12. Unio gibbosus Barnes. 



13. Lanipsilis lutcolus Lam. 



14. Strophites undulatns Barnes. 



15. S. edentulus Sdiy. This may be 5. undulatus. 



U. S. Fish Commission, 



Washington, D. C. 



