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. — Aiiiitiuny of the Ciiip: 6r, bniiiohise, or Kills; c, lieurt; /, liver; vn, vn' 

 swimining-blndder; cz, iiitei«(.iii»l canal ; o, ovarium ; «, ureter; a, anus; o', gen- 

 ital openins: ; «'. opening of ureter. Tlie side-view shows the disposition ot the 

 muscles in vertical Unkes. 



