Paleontology. 169 
structure to another in the phylogenetic history of 
tails. This has been so clearly and so tersely conveyed 
Fic. 67.—Successive stages in the development of an existing Deer’s 
Antlers. (After Gaudry, but a better illustration has already been 
given on p. 100.) 
‘B 
Fic. 68.—Homovercal Tail, showing (A) external form and 
(B) internal structure. 
by Prof Le Conte, that I cannot do better than quote 
his statement. 
