Smithsonian Report, 1913. — Edwards. 



Plate 8. 



«, black abalone shell with pearl form inserted; b, head of shell 

 pearl form on inner side of black abalone shell; c, culture pearl 

 formed in the green abalone in seven months. 



Interior View of the Red Abalone 

 Shell. 



Showing- pearly center within the muscle scar. 



Shell of the Green Abalone. 



The anterior portion polished. 



