CHARACTERS OF THE SOUTH AMERICAN" MONKEYS. 



101 



In Cacajao the length of the hand as compared with the foot 

 is about the same as in C'ebus ; but in the former genus the 

 pollex is shorter and the interval between digits 2 and 3 is a 



Text -figure 6. 



A. Right hand of Cebus, from below. 



B. Right foot of the same. 



C. Right hand of Lacfothrix Infumatus, from below. 



D. Right foot of the same, with abnormal basal webbing between digits 2 



and 3. 



X I approx. 



little greater than between 3 and 4 or 4 and 5, thus foreshadow- 

 ing the more marked inequality in spacing that obtains in 

 Alouatta and Lagothrix. (Text-fig. 5, A, B.) 



