168 COMPARATIVE DENTAL ANATOMY 



pattern which is found in both extinct and recent 

 species. The little Biblical Coney (Hyrax) is 

 unique in that it is closely allied to the Ehinoceros 

 in the pattern of its molars. The central incisors 

 are very large, and similar to the rodents. The 

 laterals are smaller, and are soon lost. The lower 

 incisors have denticulated edges which bite upon 

 a callous part behind the upper incisors. It has 

 the formula, — 



. 2-2 0-0 4-4 3-3 oa 



The Tapir has the formula, — 



- 3-3 1-1 4-4 3-3 Aei 



K ^3 C -H P ' m '3^ m '3^ = 42 - 



The incisors are round, and with a transverse 

 groove between the edge and the basal ridge into 

 which the lower incisors fit. The outer incisors 

 are long and caniniform. The canines are rather 

 small and pointed. The lower incisors are 

 smaller than the upper. The molar series are 

 partly tuberculate and partly triturating on the 

 surface; the lowers are of the double transverse 

 ridge type. There were many extinct forms of 

 the Rhinoceros and Tapir which had similar den- 

 titions, and by which the remains are readily 

 recognized. 



The ProboscidcE are the large mammals which 

 have a long proboscis, — the living Elephant, the 

 extinct Elephants, Mammoths, Mastodons, etc. 



