4 6 



ECONOMIC ZOOLOGY 



h 



PIG. 29. An oyster in the right valve of the shell, dissected so as to show the 

 internal organs. The anterior end of the body is at the top of the figure, and the 

 dorsal surface on the right hand. Xi. b, the mantle; c, the muscle; d, the heart; 

 g, the gill; h, the lips; *', the intestine; j, the liver; m, the mouth; s, the stomach. 

 (From Brooks, The Oyster.) 



