THE ALIMENTARY CANAL. 



83 



lower animals, the intestines lie more or less loose in the 

 abdomen ; but in the Crocodile, and likewise in Birds and 

 Mammals, they are supported by a membrane called mes- 

 entery. 



Fig. 48.— Anatomy of the Carp: br, branchiae, or gill-openings; c, heart; /, liver; vn, 

 vn\ swimming-bladder ; ci, intestinal canal; o, ovarium; u, ureter; a, anus; o', 

 genital opening; u', opening of ureter. The side-view shows the disposition of 

 the muscles in vertical flakes. 



