of Lakes Suj^erior and Thiron. 269 



4. Limncea umbrosa, Say. Manitouwaning ; Lacloche Island ; Owen 



Sound ; Sarnia. 



5. " umhilicata, Say. Manitouwaning, 



6. " caperata, Say. Tequamenen River; Batch-ah-wah-nah 



Bay. 



7. " modicella, Say. Sarnia. 



8. Planorbis trivolvis, Say. Sousonwagami Creek (S. side L. Superior) ; 



Sarnia. 



9. " campanulatus^ Say. Lacloche Island ; Manitouwaning ; 



Owen Sound ; Small lake at Cape Rich ; Sarnia. 



10. " bicarinatus, Say. Tequamenen River ; Batch-ah-wah-nah 



River ; Lacloche Island ; Manitouwaning ; Sarnia. 



11. " armigerus, Say. Bruce Mines ; Manitouwaning. 



12. " parvus, Say. Sousonwagami Creek. 



13. jlmnicolaporata, B&j. Sousonwagami Creek ; Owen Sound. 



14. Valvata tricarinata, Say. Sousonwagami Creek , Owen Sound. 



15. " humeralis, Say. Owen Sound. 



16. Paludina decisa, Say. Tequamenen River ; Goulais River ; Batch- 



ah-wah-nah River ; Owen Sound ; Sarnia. 



17. Melania Niagarensis, Lea. Tequamenen River; Batch-ah-wah-nah 



Bay, a large coarse variety ; common along the shore 

 of Georgian Bay from Cabot's Head to Collingwood. 



18. " acuta, Lea. Abundant in St. Mary's River below the 



Sault. 



Fresh-Water Lamellibranchiata. 



1. Unio complanatus, Lea,. Sousonwagami Creek ; Tequamenen River ; 



Batch-ah-wah-nah Bay ; Goulais River ; Mississaugi 

 River ; Lacloche Island. 



2. " radiatus, Lam. Sousonwagami Creek ; Batch-ah-wah-nah Bay ; 



Goulais River ; Sugar Island ; Mississaugi River ; 

 Lacloche Island. 



3. " ventricosus, Barnes. Mississaugi River, very abundant. 



4. " rectus. Lam. Mississaugi River. 



5. " ellipsis. Lea. Mississaugi River. 



6. Margaritana rugosa, Barnes. Mississaugi River. 

 *l. " marginata. Lea. Mississaugi River. 



8. Anodonta cygnea, Linn. Sousonwagami Creek ; Lacloche Island. 



9. " subcylindraca, Lea. Batch-ah-wah-nah Bay ; Goulais 



River; Sousonwagami Creek. 



10. " Benedictiana, Lea. Sousonwagami Creek ; Grand Ma- 



rais; Batch-ah-wah-nah Bay ; Sugar Island; Lacloche 

 Island. 



11. " fragilis. Lam. Sousonwagami Creek. 



12. " .A species like A. impiicata, Say, Batch-ah-wah-nah 



Bay. 



13. Cyclas similis, Say. Owen Sound. 



