The poison fangs of the sullen Puff .\dder {Bills arietans). When he bites 

 the fan'];s are erected as here seen. When at rest they lie in a sheath 

 along the upper jaw. 



A Puff Adder braced up ready to deUver a fatal thrust. Puff Adders are 

 thick and broad, and average 3 ft. in length. They are exceedingly 

 venomous. 



