I ' THE MOLLUSC A OF GEORGIAN BAY 97 



r 



oESSIONAL PAPER No. 39b 



In deep dredging from sandy or gravelly bottoms, the Sphaeriidae and the 

 genus Valvata are obtained. 



The total number of species identified is 37, representing 14 genera in 8 families, 

 as follows: — 



I. Family lymnaeidae. 



A. Genus Lymnaea. 



1. Lymnaea stagnalis sanctamariae, Walker. 



2. Lymnaea (Galba) decollata, Mighels. 



3. Lymnaea (Galba) emarginata canadensis, Sowb. 



4. Lymnaea (Galba) palustris, Muller. 



5. Lymnaea (Pseudosuccinea) columella, Say. 



6. Lymnaea (Acella) haldemani, (Deshayes) Binney. 



B. Genus Flanorbis. 



7. Planorbis (Helisoma) hicarinatus. Say. 



8. Planorbis (Pierosoma) trivolvis, Say. 



9. Planorbis (Planorbella) campanulatus , Say. 



10. Planorbis (Menetus) exacuous. Say. 



11. Planorbis, (Menetus) dilatatus, Gould. 



12. Planorbis (Gyraulus) hirsutus, Gould. 



13. Planorbis (Gyraulus) deflectus, Say. 



II. Family physidae. 



C. Genus Physa. 



14. Physa heterostropha. Say. 



15. Physa ancillaria, Say. 

 15a. Physa ancillaria tnagnalacustris , Walker. 

 15b. Physa ancillaria vinosa, Gould. 



16. Physa gyrina, Say. 



17. Physa integer niagarensis, Lea. 



D. Genus Ancylus. 



18. Ancylus parallelus, Hald. 



III. Family streptomatidae. 



E. Genus Goniobasis. 



19. Goniobasis livescens, Menke. 



20. Goniobasis haldemani, Tryon, 



IV. Family amnicolidae, 



F. Genus Amnicola. 



21. Amnicola limosa, Say. 



22. Amnicola em,arginata, Kiister. 



23. Amnicola lustrica, Say. 



V. Family valvatidae. 



G. Genus Valvata. 



24. Valvata tricarinnta. Say. 



25. Valvata sincera, Say. 



VI. Family viviparidae. 

 H. Genus Campeloma. 



26. Campeloma decisum, Say. 

 39&— 7 II 



