U. S. B. F.— Doc. 920. 



FIG. 21.— SHELL OF THE EASTERN OYSTER, Ostrea virginiana, TWO-THIRQS 



NATURAL SIZE. ■ 



This species is planted when young and grown to maturity in the waters of western Wash- 

 ington. The eastern oyster industry is not yet developed in Oregon. See discussion under 

 The Southwestern Washington Region, beginning on page 17. 



FIG. 22.— SHELL OF THE 

 WESTERN OYSTER. 



Ostrea lurida, TWO- 

 THIRDS NATURALSIZE. 



This species is grown in 

 both Oregon and Washing- 

 ton. In Puget Sound the in- 

 dustry has become an exten- 

 sive one. 



FIG. 23.— SPAT OF THE WESTERN 

 OYSTER COLLECTED ON THE 

 SHELL OF Paphya staminea, TWO- 

 THIRDS NATURAL SIZE. 



The spat was collected durin',' the season 

 of 1917 and was about five months old. 



