whili! the rtiilnil nortn (or heart) is a iii('(li:iii vessel lyiiin in the 

 cndostyhir ccelomic canal. Alon^ the dorsal surface of the 

 liver in the Cd'loniic space between the liver an<l the atrial 

 membrane may be seen three or four hcpntir veins lyinn side by 

 side, and in the ctrlomic cavity surroundin^i each j^onad a iiion; 

 or less prominent blood vessel is located. 



The reproductive oryana occupy similar positions in the two 

 sexes. The sections show them extending; toward the atrial 

 cavity from the re^;ion of the atrial folds. If availal)le, examine 

 demonstration section through ovaries containing ripe eggs. 



The liver is located at the right of the pharynx and appears to 

 lie free within the atrial cavity between the pharynx and the 

 gonad. Its walls are thick. 



Upon the outline drawing of the transection represent the 

 structures which are missing. Certain structures should be 

 represented in colors as follows: 



Nervous organs, green. 



Notochord, brown. 



Celom, yellow. 



Connective tissue, blue. 



Blood vessels, red. 



Muscle, stippled with black. 



Gonads, purple. 



