PLATE LII. 



TAGE 



Figs. 1-8. Baenea (Scobina) costata (Linne) 192 



1. Exterior of left valve. Wailes Bluff. X % 



2. Interior of right valve. Wailes Bluff. X % 



3. Interior of left valve. 



4. Exterior of right valve. 



5. Myophore from right valve, external view. X 2% 



6. Internal view of the same specimen. 



7. Myophore from left valve, external view. X 2% 



8. Internal view of the same specimen. 



258 



