PLATE LXVI. 



PAGE 



Fig. 1. Panopea goldfussii Wagner 277 



1. Exterior of right valve. Plum Point. 



Fig. 2. Panopea Americana Conrad 278 



2. Exterior of left valve. Plum Point. 



Figs. 3-6. Saxicava arctica (Linne) 278 



3. Exterior of left valve. Plum Point. 



4. Exterior of right valve. Jones Wharf. 



5. Interior of left valve. Jones Wharf. 



6. Exterior of right valve of one of numerous distorted forms. 



Chesapeake Beach. 



