168 Darwin, and after Darwin. 
all. In the mid-Miocene we meet with two-pronged 
horns (Cervus dicrocerus, Figs. 61, 62, } nat. size). 
Next, in the upper Mivcene (C: matheronis, Fig. 
63, # nat. size), and extending into the Pliocene 
(C. pardinensis, Fig. 64, 7s nat. size), we meet with 
three-pronged horns. Then,in the Pliocenewe find also 
four-pronged horns (C. ésstodcrensis, Fiz. 65, 7g nat. 
size), leading us to five-pronged (C. tetraceros). Lastly, 
in the Forest-bed of Norfolk we meet with arborescent 
Fic. 61. Fic.62. Fic.63. Fic. 64. Fic. 65. Fic. 66. 
The series is reduced from Gaudiy’s illustrations, after Farge, Croizet, 
Jobert and Boyd Dawkins, 
horns (C. Sedgwickit, Fig. 66, sz Mat. size) The 
life-history of existing stags furnishes a parallel 
development (Fig. 67), beginning with a single horn 
(which has not yet been found palaontologically), 
going on to two prongs, three prongs, four prongs, and 
afterwards branching. 
Coming now to bones, we have a singularly complete 
record of transition from one type or pattern of 
