184 OPHIDIANS. - 
description of these parts is referred to Rymer Jones, article 
“Reptilia,” Cyclopedia of Anatomy and Physiology; J. lL. 
Soubeiran, “De la Vipere,” Paris, 1855; and Owen, on the 
“Skeleton and Teeth,” Philadelphia, 1854. A consultation 
of these works, in connection with Dr. 8. Weir Mitchell’s 
Fia, 15.* 
a,a, Secernent ceca. 6, b, b. Small ducts. 
“Researches,” will furnish an 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. 
