82 FAUNA ANTIQUA SIVALENSIS. 
PuatTeE 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 drawing shows the descending process of the jaw. 
Fig. 2.—H. Sivalensis. Right 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. 
Fig. 3.—H. Sivalensis. Left 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. 
Fig. 4a.—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. 
Fig. 6.—H. Sivalensis. Premolar from lower jaw.—B.M. 
Figs. 7, 7a, 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.—H. Sivalensis. Fragment of upper canine with 
truncated anterior extremity and reniform outline on section.—B.M. 
Figs. 9 and 9a.—H. Sivalensis. Fragment of upper canine, with 
truncated anterior extremity and reniform outline on section. 
Fig. 10.—H. Stvalensis. 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) Paleindicus. 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. 
— bv. 
Fig. 12.—H. Paleindicus. 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. 
