686 
POPULAR SCIENCE REVIEW. 
resembles a hand-flexor in its origin from the proximal bone of the limb. 
Likewise are we impressed with the very large size of the rectus anticus 
major, and the generally extensive development of the muscles of the ventral 
surface of the spine. All these peculiarities of muscular structure must be 
considered in connection with the singular movements which this animal is 
capable of making, and which it habitually employs in its arboreal manner of 
life. We allude especially to its sloth-hke mode of progression, and its great 
power of slowly and easily raising up the head and anterior part of the body, 
while hanging suspended by its posterior extremities alone. 
