OPHIDIA OK SERPENTS. 



231 



object of much greater diameter than the serpent itself. 

 Their teeth are pointed, smooth, and arched towards the 

 throat. 



FIG. 264. 



Showing the internal structure of a Serpent. 



I, tongue and glottis ; ce, gullet cut across at <z' to show the heart, etc. ; i, the 

 stomach ; i', intestine ; cl, cloaca; are, anus ; /, liver ; o, ovarium ; o', ova ; t, wind- 

 pipe ; p, principal lung ; p', little lung ; vi, ventricle ; c. left auricle ; c', right auri- 

 cle; ay, left aorta; ad, right aorta; a', ventral aorta ; ore, carotid arteries ; v, supe- 

 rior cava ; PC, inferior cava; vp, pulmonary vein; a, alimentary canal or gullet, upper 

 portion. 



