383 



The incisive teeth are of the common wedge-like form, and are six in 

 number, which is the exact number of those of the tapir, with which they 

 also very nearly agree in their forms. 



In the fossil specimens of the upper jaw are also the corresponding 

 number of six incisors; behind which is the upper canine tooth, which 

 does not project any more than that of the tapir or pecari. Behind this 

 tooth is a small space for the reception of the point of the canine tooth of 

 the lower jaw. 



The upper grinders have their crown nearly square, and have four 

 roots, whilst those of the lower have but two : the foremost only are a 

 little narrower in proportion than the others. 



The outer face inclines obliquely inwards as it descends, and is divided 

 by three longitudinal ridges, into two concavities, rounded towards the 

 root, and terminating in a point towards the grinding surface. By the 

 angles thus formed, a line results at the outer edge of the grinding, sur- 

 face, in the shape of a W. ; and from the inclination and the concavities 

 on the external surface results another line in the form, of a W. in the 

 horizontal direction. In these teeth, then, are the same squareness of 

 form, the longitudinal ribs on the external face,, and the same line in the 

 shape of a W. as in the upper grinders of the rhinoceros; but the distri- 

 bution of the risings and depressions on the grinding surface, and of the 

 enamel, is essentially different. 



Plate XXI. Fig. 4,. represents the outer surface of the fourth molar 

 tooth of the lower jaw of P. medium, and Fig. 5, represents its inner sur- 

 face. Fig, 6 is the outer surface ; and Fig. 7 is the inner surface of one of 

 the molares of the upper jaw of the same animal. 



Thus Cuvier has been able to determine, that in the gypsum there 

 exist the remains of an animal which had 28 grinding teeth, 12 inci- 

 sive, and 4 canine. The lower grinders formed in two or three simple 

 crescents, and the upper square, with many markings on their crown : 

 the canine teeth not passing out of the mouth. It appears, also that this 

 animal must, from the number of its teeth, have been of a genus near to 



