78 



MATERIALS FOR A MEMOIR ON 



This position is maintaiued in Fig. 14. Fig. 14 is a repetition 

 of Fig. 1, and the stride is complete. The gait is shifted to left 

 laterals in Figs. 15 and 16. 



Fig. 14 op series.) 



Figs. 13 and 14 can be compared with advantage with Figs. 3 

 and 4, 13 and 14 of Procyon (series 744). The feet are relatively 

 in the same position. 



In the baboon the dorsal line changes scarcely at all from that 

 in the other figures. In Procyon the dorsal line is more convex 

 in these figures than in any others. 



The most characteristic position of Procyon is the laterals in 

 Figs. 11 and 12. The limbs are in the extreme of movement, 

 the hind backward and the fore forward. The most character- 

 istic position of the baboon (Fig. 6) is the reverse of this, the hind 

 limb being forward and the fore backward. The relative places 

 of the " on" and " off" feet are directly opposed. 



The Sloth. (Series 750.) 



The sloth does not use the limbs in lateral heterochiry. He is 

 compelled to keep the feet "on" in combinations which will insure 

 his support. Owing to the hook-like grasp of the feet, the hind 

 limb becomes markedly rotated outward as it passes back of the 

 vertical line (see p. 38). 



Fig. 1 is in the same position as in the baboon (Figs. 6 and 7), 

 — i.e., the fore and hind limb of the same size (viz., the left) 

 are at the nearest point possible one to the other. But the other 

 two limbs, while lying at the farthest point possible from each 



