8Q MAMMALIAN ANATOMY 



verse process is larger. The neural canal is smaller, and the body 

 has a somewhat greater dorso-ventral diameter. 



The Fifth Thoracic Vertebra (Figs. 50, 52, 53) differs from the 

 fourth in having less than two-thirds of its height dorsal to the caudal 

 articular surfaces. 



The spinous process may be slightly shorter. 



The caudal part of the laminae is narrower transversely, as is also 

 the cephalic emargination. This can be tested by placing the cephalic 

 edges of the two vertebra? together. 



The cephalic and dorsal surfaces of the transverse process are 

 larger, and the lateral surface, which is nearly square, faces more 

 directly laterally. 



The Sixth Thoracic Vertebra (Figs. 50, 52, 53) may be distin- 

 guished from the fifth by the transversely narrower caudal edge of the 



Fifth. 



EiyMh. Xinth. 



THE FIFTH, SIXTH, SEVENTH, EIGHTH, AND NINTH THORACIC VERTEBRAE, SIDE VIEW 



laminae and the narrower emargination on the cephalic edge. Three- 

 fifths of the maximum height is dorsal to the caudal articular surfaces. 



The spinous process is somewhat shorter, but has a more marked 

 inclination toward the tail. 



The lateral surface of the transverse process is quadrate, or slightly 

 elongated in a cephalo-caudal line. It faces laterally and toward the 

 head. The caudal intervertebral notch is slightly smaller. 



*The Seventh Thoracic Vertebra (Figs. 50, 52, 53). The lateral 

 surface of the transverse process is oblong, almost parallel with the 



