102 CANADIAN FOSSILS. 



Explanation of Figuees. Plate XI. 



Pig. I. B. Logani (var. reniformis) ; magnified 4 times : a, right valve ; b, dorsal view ; 



c, anterior view. From Hawkesbury. 



Fig. 2. B. Logani; magnified 4 times: a, left valve ; b, dorsal, and c, posterior view. 



From Hawkesbury. 

 Pig. 3. B. Logani; magnified 4 times : a, left valve ; b, ventral, and c, posterior view. 



From Grenville. 

 Fig, 4. B. Logani ; magnified 4 times : a, right valve ; b, dorsal view. From 



Hawkesbury. 

 Fig. 5. B. Logani (var. leperditoides) ; magnified 4 times : a, right valve ; b, anterior 



view. From Grenville. 

 Pig. 6. Leperditia Canadensis (var. nana) ; magnified 4 times : a, left valve ; 6, ven- 

 tral, and c, posterior view. From Grenville. 

 Fig. T. L. Canadensis (var. nana) ; magnified 4 times : a, right valve ; b, ventral view. 



From Grenville. 

 Fig. 8. L. Canadensis (var. labrosa) : magnified 4 times : a, left valve ; b, venti-al, 



and c, anterior view ; d, portion of surface of a, very highly magnified 



(X 75). 

 Fig. 9. L. Canadensis (var. nana) ; magnified 4 times : a, left valve ; 6, dorsal, and c, 



anterior view. From Grande Isle. 

 Fig. 10. L. Canadensis (var. nana) ; dorsal view of the united valves (nearly closed) ; 



magnified 4 times. From Grande Isle. 

 Fig. II. i. Canadensis (var. Louckiana) ; a, right valve, magnified 2 diameters; 



6, ventral view ; c, anterior view ; d, outline, magnified 4 times. From 



Louck's Mill. 

 Pig. 12. L. Canadensis (var. Pauquettiana) : a, right valve, magnified 2 diameters ; 



b, the ventral, and c, the anterior view, showing the inner flange of the 

 ventral edge ; d, outline, magnified 4 times. From Pauquette's Rapids, 

 AUumette Island. 



Pig. 13. L. Anna; magnified 4 times : a, right valve ; b, ventral, and c, anterior view ; 



d, portion of surface of a, highly magnified (X 25). From St. Anne's. 

 Fig. 14. Isochilina Ottawa; magnified 4 times : a, left valve ; b, anterior, and c, ventral 



view. From Grenville Canal. 

 Fig. 15. /. gracilis; magnified 4 times : a, right valve ; b, anterior view, and c, ventral ; 



d, magnified portion of the marginal rim. From "White Horse Rapids. 

 Fig. 16. L. Canadensis (var. Josephiana) ; natural size : a, right valve ; b, ventral, and 



c, anterior view. From St. Joseph's Island. 



Pig. 1*7. L. Canadensis (var. Anticostiana) ; natural size : a, left valve ; 6, ventral view. 



From Anticosti. 

 Pig. 18. L. amygdalina ; natural size : a, right valve ; b, ventral, and c, anterior view. 



From L'Orignal. 

 Fig. 19. L. amygdalina; natural size : a, left valve; b, ventral, and c, anterior view 



From L'Orignal. 



