LABORATORY WORK: 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. 



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