PLATE XII. 



FIGS. 1 to 6. Diagrammatic figures of genera to show important character referred to in 

 the text o, ocular tubercle m, scar of adductor muscle c, cardinal or hinge 

 line a, anterior cardinal curve b, posterior cardinal curve e, anterior mar- 

 ginal curve d, posterior marginal curve v. ventral margin. See p. 154. 



FIG. 7. Leperditia (??) rugosa. o, right valve, side view b, same from the front 

 e, same from the hinge. All Mag. f , Assise E. 3. /. Gillis Indian brook 

 Escasonie, N. S. See p. 155. 



Bradorona perspicator. a, left valve, side view 6, same from behind e, 

 same from the hinge. All mag. f d, a portion of the shell further mag. Y- 

 Assise E. 1. d. Dugald brook, Escasoni, N. S. See p. 156. 



FIG. 9. B. perspicator, mut. maxima. a, right valve, side view b, same from 

 the front. Both Mag. \ , Assise E. 1 c. Dugald brook, Escasonie, N. S. See p. 

 157. 



FIG. 10. B. perspicator, mut. major. a, right valve, side view I, same from 

 the front. Both Mag. \ , Assise E. 3. /. Gillis Indian brook, Escasonie* 

 N. S. See p. 158. 



FIG. 11. B. perspicator, mut. magna. a, right valve, side view 6, same from 

 the front. Both Mag. f , Assiae E. 2 b. Dugald brook, Escasonie, N. S. See p. 

 158. 



FIG. 12. Bradorona spectator. a, left valve, side view 6, same from the front 

 c, same from the hinge d, mould of the upper front corner of a right valve 

 showing ocular tubercle and muscle scar. All Mag. { , Assists E. 1 c. and d. 

 Dugald brook, Escasonie, N. S. See p. 158. 



FIG. 13. B. spectator, mut. spinosa. , left valve, side view b, same from the 

 front. Both Mag. f. Assise E. 1 c. Dugald brook, Escasonie, N. S. See p. 

 159. 



FIG. 14. B. spectator, mut. cequata. a, left valve, side view b, same front view. 

 Both mag. f . Assise E. 3 d. Dugald brook, Escasonie, N. S. See p. 160. 



FIG. 15. Bradorona observator. a, left valve 6, same from tiie front c, same 

 from the hinge. All Mag. f . Assise E. 1 d. Dugald brook, Escasonie, N. S. 

 Seep. 160. 



FIG. 16. B. observator var. benepuncta. Carapace partly opened, the valves 

 laterally foreshortened. Mag. f . Assise E. 1 d. Dugald brook, Escasonie, 

 N. S. See p. 161. 



FIG. 17. B. observator mut. liyata. Left valve, side view. Assise E. 3 e. Dugald 

 brook, Escasonie, N. S. See p. 162. 



