THE LIZARD 81 



that the heart consists of two auricles with a muscular 

 ventricle between and behind them. 



From the anterior end of the ventricle arise three ar- 

 teries rather closely bound together. One, the pulmonary 

 artery, goes to the lungs. The other two, right and left 

 aortic arteries, send branches to the head, trunk, tail, and 

 other parts of the body. 



Find several veins, darker in color than the arteries, that 

 lead to the heart. 



The digestive organs. Clear away any masses of fat that 

 may be in the posterior part of the body. Begin at the 

 mouth and trace the alimentary canal, noting the following 

 parts : - 



A gullet leading to the stomach. 



The stomach quite a little wider than the gullet and with 

 hard, muscular walls. 



Following the stomach, the small intestine, or duodenum, 

 which is more or less coiled. 



The duodenum is succeeded by the large intestine, or 

 rectum, which often contains undigested matter. 



At the point of union between the small and large intes- 

 tine, the latter is produced into a short, blind sac, the ccecum. 



The rectum joins the cloaca, the dilated posterior end of 

 the alimentary canal. 



The liver is large and divided into a right and left lobe. 

 It lies in the anterior part of the body cavity, and has a 

 gall bladder which connects through a duct with the duo- 

 denum. 



The pancreas is situated in the loop between the stom- 

 ach and small intestine. 



Make a diagram of the digestive organs. 



Excretory organs. Note the two dark red kidneys lying 



HERRICK LAB. EX. 6 



