20 
INTRODUCTORY. 
W- The bones of the tarsus. 
18. The projection of the os calcis. 
X. The metatarsal bones. 
Y. The phalanges of the toes. 
19-19-19-19. The pelvis. 
BONES OF THE HEAD AND NECK. 
20. Os fronds. 
21. The parietal bone. 
22. The temporal process of the sphenoid bone. 
23. The squamous part of the temporal bone. 
2*. The mastoid process of the temporal bone. 
25. The superior maxillary bone. 
26. The nasal bone. 
27. The malar, or cheek bone. 
28. The lower jaw. 
Fig. 2. —JAWS OP THE MANDRILL. 
1. Incisory teeth. 
2. Canine teeth. 
3. Molars or grinders. 
The upper jaw of the whole class is fixed to the cranium ; 
the lower jaw consists of two pieces, and is articulated by 
a projecting condyle into an immoveable temporal bone. 
The neck is composed of seven, and in one species, of nine, 
vertebrae. The anterior ribs are attached to a sternum, formed 
of various pieces placed vertically. Their anterior extremity 
commences from a shoulder-blade or scapula, which is not arti¬ 
culated to any other bone, but merely suspended in the flesh, 
and often indeed resting solely on the sternum by an interme¬ 
diate bone, denominated the clavicle. This extremity is con¬ 
tinued by an arm, a fore-arm, and a hand, which is itself formed 
of two ranges of small bones called the carpus, and another 
called the metacarpus, and the fingers, each composed of two 
or three bones termed phalanges. 
The whole of this class, with the exception of the Cetacea, 
have the posterior extremity fixed to the spine, where it shelves 
