PLATE XL 



(Page 91—102.) 



Fig. 1. B. Logani (var. reniformis) ; magn-ified 4 times : a, right valve ; b, dorsal view ; 



c, anterior view. From Hawkesbury. 



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



From Hawkesbury. 

 Fig. 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. lepeditoides) ; magnified 4 times : a, right valve ; b, anterior 



view. From Grenville. 

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

 tral, and c, posterior view. From Grenville. 

 Fig. 7. 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, ventral, 



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



(X ^5). 

 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 cloeed) ; 



magnified 4 times. From Grande Isle. 

 Fig. 11. L. Canadensis (var. Louckiana) ; a, right valve, magnified two diameters ; 



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

 ■ Louck's Mill. 



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

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

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

 Allumette Island. 



Fig. 13. L. Anna; magnified 4 times : a, right value ; 6, 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. J. gracilis ; magnified 4 times . a, right valve ; 6, 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. 



Fig. 17. L. Canadensis (var. Anlicostiana) ; natural size ; a, left valve ; 5, ventral view. 



From Anticosti. 

 Fig. 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 ; 6, ventral, and c, anterior view. 



From L'Orignal. 



