1 68 Darwin, and after Darwin. 



all. In the mid-Miocene we meet with two-pronged 

 horns (Cervus dicrocerus. Figs. 61, 62, -J nat. size). 

 Next, in the upper Miocene (C. matheronis, Fig. 

 63, | nat. size), and extending into the Pliocene 

 (C. pardinensis y Fig. 64, T X g nat. size), we meet with 

 three-pronged horns. Then, in the Pliocene we find also 

 four- pronged horns (C. issiodorensis, Fig. 65, y^ nat. 

 size), leading us to five-pronged (C. tetraceros). Lastly, 

 in the Forest-bed of Norfolk we meet with arborescent 



FIG. 61. FIG. 62. FIG. 63. FIG. 64. FIG. 65. FIG. 66. 



The series is reduced from Gaudry's illust-ations, after Farge, Croizet, 

 Jobert and Boyd Dawk ins. 



horns (C. Sedgwickii, Fig. 66, ^ nat. size). The 

 life-history of existing stags furnishes a parallel 

 development (Fig. 67), beginning with a single horn 

 (which has not yet been found palaeontologically), 

 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 



