SUPPLEMENT. I2IQ 



ENEMIES TO OYSTERS. 



The enemies of oysters are numerous and indefati- 

 gable. They may be divided into two classes : 



A. Living. 



B. Inanimate. 



The living enemies may be further divided into : 



A. Those which are directly injurious. 



B. Those which are indirectly injurious. 



Class A. 



LIVING ENEMIES. 

 Subdivision A (directly injurious). 



1. Skates and Rays. 



2. Octopods. 



3. Echinodermata (starfish, sea-urchins, &c.) 



4. Crustacea (crabs, prawns, &c.) 



5. Whelks, &c. 



Subdivision B (indirectly injurious). 



1. Mussels. 



2. Cliona. 



3. Weed, sabella, acorn-barnacles, annelids, polyps, 

 poch, blubber, &c. 



Class B. 

 INANIMATE ENEMIES. 



1. Sand. 



2. Mud. 



3. Fresh water. 



4. Frost, ice, and snow. 



5. Sewage and other poisonous contamination of the 



water. 



oo 2 



