502 FAUNA ANTIQUA SIVALENSIS. 



Plate LXII. 



Fig. 1. — Hippopotamus {Hexaprotodon) Sivalensis. Left side of 

 lower jaw, viewed from above, with three molars and the three pos- 

 terior premolars. The trefoil wear of the coronals of each pair of 

 collines is well seen. The fragment is broken off in front of the second 

 premolar. The di-awing shows the descending process of the jaw. 

 (Reproduced in PI. XII. fig. 1.) 



j'ig. 2. — H. Sivalensis. Eight side of lower jaw, with three molars 

 and four premolars. The specimen is remarkable as showing the first 

 or foremost premolar, which in most of the specimens is wanting. The 

 canine is absent, but the three right incisors are present. The teeth 

 are less worn than in fig. 1, the posterior molar being intact. — B.M. 



Fi(T. 3. — H. Sivalensis. Lefl side of lower jaw, viewed from above, 

 showing the two anterior molars, and a portion of the third or posterior 

 molar ; also the four premolars, the fourth or posterior one being very 

 small. Both the molars and premolars are well ground, so that the 

 animal was probably old. The specimen also shows the canine tooth 

 broken off, and the alveoli of the three left incisors. — B.M. 



Fig. 4. — H. Sivalensis. Anterior margin of lower jaw, showing the 

 six incisors, all about the same size, with the two canines incomplete. 

 —B.M. 



FitT. 4 a. — H. Sivalensis. Vertical section from side to side through 

 anterior portion of lower jaw, with sections through the six incisors 

 and two canines, showing the relative position of their alveoli. — B.M. 



Fig. 5. — H. Sivalensis. Premolar from lower jaw. — B.M. 



FicT. 6. — H. Sivalensis. Premolar firom lower jaw. — B.M. 



Figs. 7, 7 a, and 7 b. — H. Sivalensis. Upper canine deeply grooved 

 along posterior surface and obliquely truncated in front. The trans- 

 verse section (7 b) presents a reniform outline — B.M, 



Figs. 8 and 8 a. — //. Sivalensis. Fragment of upper canine with 

 truncated anterior extremity and reniform outline on section. — B.M. 



Figs. 9 and 9 a. — H. Sivalensis. Fragment of iipper canine, with 

 truncated anterior extremity and reniform outline on section. 



Fio-. 10. — H. Sivalensis. Lower canine, curved upwards and slightly 

 backwards at tip. The point obliquely truncated on its posterior 

 surface. The form of the tooth is such as to present a pyriform outline 

 when cut across. — B.M, 



Fig. 11. — Hippopotamus {Tetraprotodon) Palwindicus. Fragment of 

 lower jaw, right side, with three molars and the three posterior pre- 

 molars. The hindmost molar is intact ; those in front are moderately 

 worn. The fourth or hindmost premolar is very small — deciduous. 

 _B.M. 



Fio-. 12. — H. Palceindicus. Fragment of lower jaw, with three 

 molars and three posterior premolars. The teeth are more ground 

 than in fig. 11. 



Figs. 13 and 13 a. — Hippopotamus {Tetraprotodon') major. Upper 

 canine, obliquely truncated at front, with cordate outline on section. 



