322 ZOOLOGY 



"the position of the light colored pancreas? Of the darker 

 spleen (this organ has no duct) ? 



Cut the large intestine about an inch from the anal opening 

 and the esophagus in front of the stomach; remove the tract 

 from the body. Split it from end to end, wash it of its contents 

 and describe and make drawings of the interior. Do you find 

 any internal parasites ? 



2 . Urinogenital Organs. — Without removing any other organs 

 identify : 



The kidneys: color, form, position. Do they have any 



outlet? The bladder; position and general structure. 

 The fat bodies : position ? With what connected ? 

 In the male: 

 Testes; yellowish, rounded bodies. With what organ 



connected ? 

 How in a fresh specimen can you be sure you have found 

 the testes ? 

 In the female : 



Ovaries, which vary much in size and appearance with 

 the time of year. What are their position and at- 

 tachments ? 

 Oviducts. Do these communicate with the body cavity ? 

 How do they communicate with the exterior ? Is there 

 any trace of the oviducts in the male ? 



3. The Lungs. — Open the mouth, find the glottis, insert a 

 blow-pipe, and inflate the lungs: number, position and shape? 

 Cut them open and examine the inner surface. 



4. The Circulatory System. 



The heart: Does this organ lie free in the body cavity? 

 What is the shape of the heart ? To what is it attached ? 

 Identify the auricles in front, and the ventricle behind. Can 

 you recognize the aorta arising from the ventricle; and the 

 venous sinus dorsal to the heart and receiving the large veins? 

 How many chambers to the heart? Their relation to each 

 other ? 



Further study can be pursued successfully only by injecting 

 the vessels with a colored mass. If time allows each student 

 may well inject the arterial system and trace its course. At 



