VISCERA OF THE FROG 327 



(d) The alimentary canal, consisting of a long tube running from the 

 mouth to the cloaca. Identify the sac-like stomach which lies to the 

 animal's left, just under the tips of the lobes of the liver, and the coiled 

 small intestine, which can be traced posteriorly to the large intestine. 

 Note the small, spherical, red spleen nearby. 



(e) The urogenital organs, consisting of the kidneys and either the 

 male gonads (testes) or female gonads (ovaries). These lie close to the 

 dorsal body wall, and can be seen by gently pushing the intestine slightly 

 to one side. In the spring, the abdominal cavity of the female is largely 

 filled with the developing eggs in the right and left ovaries. 



(/) Arrange the organs to the best advantage, and make a full page 

 drawing to show as many as possible of the observed structures. 



