184 OPHIDIANS. 
description of these parts is referred to Rymer Jones, article 
“Reptilia,” Cyclopedia of Anatomy and Physiology; J. 1. 
Soubeiran, “De la Vipere,” Paris, 1855; and Owen, on the 
“Skeleton and Teeth,” Philadelphia, 1854. A consultation 
of these works, in connection with Dr. S. Weir Mitchell’s 
Fic. 15.* 
a, a. Secernent ceca. 5b, b, b. Small ducts. 
“ Researches,” will furnish am exhaustive study of the subject 
in reference to Ophidians provided with fangs. 
I intend to publish, at a future day, a like study of the 
same apparatus In poisonous serpents not provided with fangs; 
such, for example, as the Vipera elaps corallinus. 
It must always be borne in mind, however, in this connec- 
tion, that there is a wide difference in many respects between 
* Researches, &c., by Dr. S. Weir Mitchell, p. 13. 
