136 OHIO STATE ACADEMY OF SCIENCE. 
PA le 
nostrit 
zi Daher, a 
——— or Sea a 
Ss 
Fig. 1. EXTERNAL VIEW OF RATTLER’S HEAD. 
The pit is seen between and below the eye and nostril. (/vom Stejneger.) 
Fig. 2, HEAD OF RATTLER. 
a, venom gland; a’, duct; 6 6’, temporal muscle; /, sheath of fang. 
(After Stejneger from Duvernoy. ) 
Fig. 3. SKULL OF RATTLER—(/vom 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. (/yvom Stejneger after Jan.) 
