89 



IV. TOXODONTIA. 



FAMILIES. 



I. Teeth 44 (M |, PM |, C \, I j|x2) ; molars of upper jaw mostly (PM 3-4, 

 M 1) oblong, moderately narrowed backwards, with two folds (the ante- 

 rior of which is divided) re-entering from the inner side. Incisors three 

 on each side, with simple fangs ; the first largest, compressed, widely 

 separated from its homologue; the second smaller, trihedral; the third 

 lateral and behind the second, and rudimentary: molars of lower jaw 

 comparatively broad and complex : canines moderate ; incisors implanted 



in a curved row. 



NESODONTIDAE. (LV.) 



II. Teeth 36 (M }, PM f, C #, I §X2) ; molars with enamel coat interrupted 

 at the anterior and posterior margins ; those of upper jaw mostly (PM 3, 4, 

 M 1—3) obliquely triangular, rapidly narrowed backwards, with a single 

 simple fold re-entering obliquely forwards from the inner side. Incisors 

 of upper jaw two on each side, but with incisorial crowns, the outer with 

 roots of nearly uniform diameter throughout, and describing the segment 

 of a circle, (like those of rodents,) and with persistent pulp — (Owen) : 

 molars of lower jaw narrowed, especially the posterior portions ; canines 



rudimentary; incisors in a nearly straight line. 



TOXODONTIDAE. (LVI.) 



LV. NESODONTIDAE. 

 Extinct. 

 Netodon Owen. 



LVI. TOXODONTIDAE. 

 Extinct, 



V. HYRACOIDEA. 



FAMILY. 

 LVII. HYRACIDAE. 



Genera. 



Hyrax Linn. 



Ibjrax Gray. Euhyrqx Gray. 



Dendrohyrax Gray^ 



IV. PROBOSCIDEA. 



FAMILIES. 



I. Incisors of upper jaw (14-1) everted, enormously developed and modified 

 as cylindro-conio tusks, with roots extending baokwards and converging, 



Toxodon Owen 



