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Oysters Grown on the Pacific Coast and Their Enemies:
1. Native, or 'Olympia' Oysters.
2. Sea Snail (Polynices lewisii), which destroys many oysters annually.
3. Eastern Oyster Bred near Nasel River, Willapa Harbor, Wash.: for many years it was supposed the Eastern Oyster would not breed on this coast.
4. Japanese oyster introduced on this coast.
5. Cluster of young native oysters.

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