PLATE V. 



End-views and section of the skull of the Mylodon robustus, half the naatual size. 



Fig. 1 . Posterior or occipital termination of the skull, 

 a. Inner orifice of the anterior condyloid canal. 

 6. Stylo-hyal articular cavity. 



c. Digastric fossa. 



d. Part of the additamentum suturse lamhdoidalis. 



e. Inferior transverse occipital crest. 



/. Situation where the superior transverse occipital crest has heen 

 depressed by the larger fracture. 



Fig. 2. Vertical transverse section of the skull through the smaller frac- 

 ture. 

 /. Situation of that fracture, showing the thickening of the outer 



table of the skull, and of the septa of the contiguous air-cells. 

 d. The vomer, which has been bent to the left side, probably by ac- 

 cumulation of pus in the inflamed sinuses adjoining the frac- 

 ture. 



Fig. 3, Anterior extremity of the cranium, forming the frame of the ver- 

 tical aperture of the great nasal aperture. 



a. Expanded terminal fossa of the anchylosed nasal bones, for the 



attachment of the cartilage of the nose. 



b. b. Superior turbinated bones. 



c. Middle meatus of the nose, above the ridge for the attachment of 



the inferior turbinated bone. 



d. The thick vertical anterior margin of the vomer. 



Fig. 4. Anterior extremity of the lower jaw. 



e. e. Tuberosities for the attachment of the retractor labii inferioris. 



Fig. 5. Anterior molar of the lower jaw : the dotted line shows the shape 

 and size of the persistent pulp-cavity. 



Fig. 6. Third molar of the upper jaw, viewed from the inner side : the 

 dotted line shows the size and shape of the pulp-cavity. [The prece- 

 ding figures having been added after an impression of the four preceding 

 figures had been taken, have not printed out sufiiciently strongly.] 



