136 



OHIO STATE ACADEMY OF SCIENCE. 



PI,ATE II. 



Fig. i. EXTERNAL, VIEW OE RATTLER'S HEAD. 

 The pit is seen between and below the eye and nostril. (From Stejneger.) 



Fig. 2. HEAD OF RATTIER. 



a, venom gland ; a f ', duct ; b b', temporal muscle ; /, sheath of fang. 

 (After Stejneger from Duvernoy.} 



Fig. 3. SKUU, OE RATTIER (from side.) 



The long fangs in the upper jaw are fixed in the maxillary bone ; this bone 



is hinged on the lachrymal (above) and the pterygoids (posteriorly). 



The excavation for the pit in the maxillary bone is seen at the 



end of the pterygoid bones. (From Stejneger after Jan.} 



