244 ALLAN HAXCOCK PACIFIC EXPEDITIONS VOL. 20 



PLATE 14 



Fig. 20. .liiadara (Scapharca) reinharti (Lowe) 1935. Bahia de 

 Chatham, Isia del Coco, Costa Rica. a. Outside of left valve. 



b. Dorsal view. c. Hinge. Length, 43 mm. 



Fig. 21. A. {Scapharca) aviculaeformis (Nyst) 1848. Isla Isabel, 

 Gulf of California, a. Outside of left valve, b. Dorsal view. 



c. Inside of left valve. Length, 54.5 mm. 



Fig. 22. A. {Scapharca) emarginata (Sowerbv) 1833. Canal de 

 Marcy, Bahia de la Magdalena, Baja California. Outside 

 of left valve. Young specimen. Length, 11.5 mm. 



Fig. 23. A. {Scapharca) aviculaeformis (Nyst) 1848. Islas Secas, 

 Panama. Inside of left valve. Length, 34.6 mm. 



