Plate 5 



Fig. 1. Cardiinn q)ta<!r(itj( iKii-iinn Conriul. Oft" San Pedro in 20 to 30 fathoms. 

 One-half natural size. 



Fig. 2. Cdvdi II )ii corbis Murtyn ; Cockle. Elkhorn Slough, Monterey Bay. Natural 

 size. Note tlie long slender foot proj ecting from between the valves. 



Fig. 3. Amiaittis cullosa Conrad; Sea c ockle. San Diego. Three-quarters natural 

 size. 



