Mr. Smith on the structure , &c. 
47 6 
an unknown species of serpent, which have exactly the same 
form as those of the rattle snake. 
I, is a section of a young fang taken about the middle : in 
this stage of growth the cavity which contains the pulp 
almost entirely surrounds the poison tube, and the edges of 
the depression which form the suture are seen to be angular, 
and present so large a surface to each other, that the suture is 
completely filled up even in this early stage of growth. 
K, is a section of a full grown fang of the same species of 
serpent at the same part as the preceding. Here the cavity of 
the pulp is seen greatly contracted from the more advanced 
stage of growth. 
