SNAKE. 



Are there any traces of limbs? Can you divide the body 

 into head, neck, thorax, and tail? If so, give reasons for 

 the divisions you recognize. What is the character of the 

 skin? What marked difference exists between the skin of 

 the head and that of the body? Are the dorsal and ven- 

 tral surfaces alike? Where is the vent? Examine a scale 

 carefully. Is there any skin outside it? Can you pull the 

 scales away from the body? Does a snake shed its skin? 



Examine the head. Open the mouth. Are teeth present, 

 and, if so, where? See the tongue. What is its character? 

 Pull it out with the forceps. Can it be protruded when 

 the mouth is shut? 



47 



