346 



MAMMALIAN ANATOMY 



plate of the lateral ethmoid. This line springs from the anterior 

 border near its middle, arches slightly upward, and then turns boldly 

 downward, so as to run nearly straight to the upper opening of the 

 lachrymal canal on the posterior border. Of the two parts of the 

 surface, the lower is bounded below by the straight line formed by 

 the attachment of the maxillo-turbinal and the ridge for the lachrymal 

 canal. This part is triangular, smooth, and slightly concave from 

 above downward. It is opposite to a part of the side of the free, lower, 

 anterior portion of the lateral ethmoid. The upper part of. the inner 



FIG. 270. 



With Frontal. 



Nasal or Ascending- Process. 



Malar Process. 



With Palatine. 



Tuberosity. 

 For Molar 



With Xasal. 



Maxillo-turbinal. 



With Premaxillary . 



For Third Premolar. 



LEFT MAXILLARY BONE, INNER ASPECT, SIDE VIEW. 



surface of the nasal process, above the curved line, is mostly rough, 

 for attachment with the frontal and with the lateral ethmoid. A 

 narrow strip along the upper part of the front margin, and a wider 

 triangular area at the upper posterior angle and half-way down the 

 posterior margin, mark the attachment to the frontal. The indications 

 of the attachment of the lateral ethmoid vary in shape and in degree 

 of development. A second curved line, above the one already de- 

 scribed, is usually present, and is shorter, and ends on the posterior 



