CONCLUSION. 



183 



swampy ground. This type of foot would be somewhat like that 

 represented in figure 149, below. 



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FiKURK 148. — Left hind limb of Bapianodon discus, Marsh; seen from below; one-eighth natural size. 

 Figure 149. — Right fore foot of Cli£lydra serpentina. lAnuieus, ; front view (after Gegenbaur). 



F. femur; F'. fibula; i. intermedium; c. central bone ; / Qbulare; m. metatarsals; R. radius; r. radiale; 

 T. tibia ; t. tibiale ; TJ. ulna ; u. ulnare. 



The Roman numerals denote the ordinal number of each digit present, counting from the inner side 

 of the pentadactyl foot. 



(2.) For locomotion on dry hard ground, a stronger foot was 

 required, and a modification would soon take place, in the interlocking of 

 the metapodials with the second row of carpals or tarsals that supported 

 them. Examples of nearly this stage are seen in the fore feet of 

 Conjplwdon and Dinoceras, as shown in figures 150 and 152, below. The 

 fore foot of the elephant (figure 156) will also serve to illustrate the same 

 stage. 



(3.) A still stronger foot was produced by the further interlocking 

 of both the first and second row of carpals and tarsals, as well as the 

 latter row witli the metapodials below. This general type of foot belongs 

 to the Holoilactyla, and is~seen. also in some of the early Perissodactyls. 



