500 FAUNA ANTIQUA SIVALENSIS. 



Plate LX. 



Fig. 1. — H. Sivalensis. Fragment of posterior portion of skull; 

 upper surface ; showing occipital ridge and left zygomatic arch. — B.M. 



Fig. 1 a. — Under surface of same specimen. 



Fig. 1 b. — Lateral view of same specimen. 



Fig. 2. — H. Sivalensis. Fine specimen of cranium, with occipital 

 ridtre, and nasal sutures distinct, and both zygomatic arches intact. — 

 B.M. 



Fig. 2 a. — Lateral view of same specimen, showing lower jaw in 

 situ. The slight elevation of the orbit above th€ plane of the frontal 

 is also seen. 



Fig. 2 h. — Posterior view o^ same specimen, showing occipital ridge, 

 condyles, and foramen magnum. 



Fig. 3. — H. Sivalensis. Fragment of posterior part of another skull 

 with both zygomatic arches. — B.M. 



Fig. 3 a. — Palatine view of same specimen, showing posterior and 

 part of middle molar, on either side. 



Fig. 3 5.— Lateral view of same specimen. 



Fig. 3 c. — Occipital, or posterior, view of same specimen. 



Fig. 4. — H. Sivalensis. Another specimen of cranium deficient in 

 muzzle and right zygomatic arch ; upper surface. 



Fig. 4 a. — Palatine view of same specimen, showing three molars and 

 one premolar, on either side, much worn. 



Fig. 4 h. — Lateral view of same specimen, showing the slight ele- 

 vation of the orbit. 



Fig. 4 c. — Posterior, or occipital, view of same specimen. 



Plate LXL 



Fig. 1. — H. Sivalensis. Fragment of young skull, sho'wing muzzle ; 

 under surface showing molars and canines and alveoli of premolars. — 

 B.M. 



Fig. 1 a. — Upper surface of same specimen. 



Fig. 1 b. — Same specimen ; lateral view. 



Fig. 2. — Hippopotamus Sivalensis. Skull, imperfect ; palatal view. 

 — B.M. 



Fig. 2 a. — Lateral view of same specimen. 



Fig. 3. — H. Sivalensis. Fragment of lower jaw, right side, viewed 

 from above. The molar line is seen to curve outwards, both in front 

 and behind, as in the upper jaw. 



Fig. 3 a. — Lateral view of same fragment. The condyle, coronoid 

 process, and the descending process are broken off. The lower margin 

 is straight. 



Figs. 4 and 4 a. — H. Sivalensis. Fragment of lower jaw, upper and 

 lateral surface. The alveolar ridge on right side is very perfect, and 



