Plate 22. 
Pagf 
Figure 1. Periploma planiusciila Sowerby. 82 
Jour. Acad. Nat. Sci., Phila. 
This is Periploma argentaria Conrad. 
2. Pec ten latiauritus Conrad.-. 57 
From Conrad’s type figure. 
Jour. Acad. Nat. Sci., Phila. 
3. Pscphidect cymata Dali.—161 
Bull. 112, U. S. N. M. 
4. Pholadidea penita concamcraia Desliayes.211 
Conch. Tconica. 
5. Pholadidea penita concamcrata Desliayes.211 
Conch. Tconica. 
6. Calyptogcna elongata Dali..116 
’ Bull 112, U. S. N. M. 
7. Para p kolas calif arnica Conrad. Chimney.210 
From type figure. 
Jour. Acad. Nat. Sci., Phila. 
8. Macoma liotricha Dali.176 
Bull. 2, Nat. Hist. Soc., British Columbia. 
9. Pholadidea m'elanura Sowerby.212 
Conch. Iconica. 
10. Pholadidea melon lira Sowerby.212 
Conch. Tconica. 
11. Pholadidea parva Tryon.213 
From type figure. 
Amer. Jour. Conch. 
12. Parapholas parva Tryon.213 
Amer. Jour. Conch, type figure. 
13. Parapholas calif arnica Conrad.210 
From type figure. 
Jour. Acad. Nat. Sci., Phila. 
