DESCEIPTION OF PLATES. 499 



Fig. 6 h. — H. Palceindkus. Same specimen viewed from above. 



Fig. 7. — H. Palceindkus. Lower end of shaft, with articulating 

 extremity, of femur, posterior view. — B.M. 



Fig. 7 a. — H. Palceindicus. Posterior view of same specimen. 



Fig. 7 h. — H. Palceindicus. Same specimen viewed from beloW. 



Figs. 8, 8 a, and 8 5. — H. Pcdcsindicus. Upper end of tibia. Anterior, 

 posterior, and upper views. — B.M. 



Figs. 9, 9 a, 9 b, and 9 c. — H. Palceindicus. Entire tibia. Anterior, 

 posterior, upper and lower views. — B.M. 



Figs. 10, 10 a, 101), and 10 c. — H. Pcdwindicus. Entire radius. An- 

 terior, posterior, upper and lower views. — B.M. 



Plate LIX. 



Fig. 1. — Hippopotamus (Hexaprotodon) Sivalensis. (Falc. and Caut.) 

 Fine specimen of entire skuU from the Sewalik hills. Upper surface, 

 showing the zygomatic arches, sagittal crest, and muzzle. The hollow 

 between the muzzle and the zygomatic arch is remarkably abrupt, and 

 the occipital crest is very elevated. — B.M. (See antea, p. 142.) 



Fig. 1 a. — H. Sivalensis. Palatine view of same specimen, showing 

 the three molars and fbiu premolars, well ground, and the alveoli of 

 the canines and six incisors. The line of molars is seen to curve 

 slightly outwards towards the front and also behind. The space be- 

 tween the most advanced molar and the canine is mxich shorter than 

 in the existing animal. There is a deep fissure in front between the 

 incisive bones. 



Fig. 1 b. — H. Sivalensis. Lateral view. The orbit projects but 

 slightly above the plane of the frontal, and in this respect the species 

 contrasts remarkably with that of the H. Pcdoiindicus, Plate LVII. fig. 

 1 a, and Plate LVIII. fig. 4 a. The orbit is also much more advanced 

 than in the existing Hippopotamus, and this accounts for the abrupt 

 hollow between the muzzle and zygomatic arch. The incisors, drawn 

 in outline, are seen to curve downwards. (Eeproduced in PI. XL 

 figs. 1, 2, and 3.) 



Fig. 2. — H. Sivalensis. Another specimen of cranium, upper surface. 

 The right zygomatic arch is imperfect ; the nasal sutures are more dis- 

 tinct than in fig. 1. — B.M. 



Fig. 2 a. — H. Sivalensis. Palate view of same specimen, showing 

 three molars and four premolars on either side. Posteriorly the molar 

 lines curve less out than in fig. 1, and the teeth are somewhat less 

 worn. 



Fig. 3. — H. Sivcdensis. Another specimen of cranium, tipper sur- 

 face. Both zygomatic arches are imperfect. — B.M. 



Fig. 3 a. — H. Sivalensis. Palate view of same specimen, showing 

 three molars and four premolars on either side. The teeth are less 

 ground than in figs. 1 and 2. The trefoil wear of the coronals of each 

 pair of colliuea is well seen. 



KK 2 



I 



