Plate 8 



Fig. 1. Saxidomus gigantcus Deshayes ; Washington clam. Humboldt Bay. 

 One-half natural size. Exterior left valve with extended siphon. 



Fig. 2. Saxidonms gigaiitrus Deshayes; Washington clam. Humboldt Bay. 

 Natui'al size. Exterior left valve of second specimen. 



