HIPPOPOTAMUS. I4i 



Occiput, occipital and sagittal crests, zygomatic arches and orbits 

 nearly entire ; also the glenoid articulating surfaces perfect ; occipital 

 condyles broken off. Teeth : the two anterior true molars worn, and 

 showing the pattern characteristic of the species ; the last molar in 

 germ, and not protruded through the gums, indicating a young adult 

 animal ; nasals raised above the plane of the front, at the naso-frontal 

 suture. An exceedingly fine specimen, more perfect than the original 

 specimen upon which was foimded the species as figured in Faun. 

 Antiq. Siv., PL LVIL, fig. 1, and PI. LVIIL, fig. 4. It shows well the 

 great saliency of the occipital and sagittal crests, and the projection 

 of the orbits above the plane of the frontal. 



N'o. 17. — Short fragment, comprising the chin portion of the lower 

 jaAV, both sides, near the anterior extremity of the symphysis, contain- 

 ing the alveoli in half section of four incisors and two canines. Dia^ 

 meter of central incisors, 1"5 in. ; of the external incisors, 1"85 in^ 

 The true chai-acter of the specimen was recognized by Dr. Spilsbury. 

 This is a very valuable specimen, as it conclusively refutes the opinion 

 put forward by De Blainville (liv. xxii., ' Hippopotamus,' page 240), that 

 the Nerbudda Tetraproto' on is identical with the living African species^ 

 the middle incisors being the largest in the latter, while the converse 

 holds in the former ; and the relative proportion of the incisors diifers 

 very remarkably.' 



II. — Note upon a YotJNa Skull of Mertcopotamus dissimilis, from 



BuRMAH. Brought by Professor Oldham^ 



{Note-Book, 28th Aug. 1862.) 



The skull is of an adolescent animal, with all the sutures open : penulti- 

 mate, antepenultimate (1st and 2nd m.) in place, present on right side, 

 crown broken, and p.m. 4 just emerging ; also p.m. 3 emerging ; other 

 teeth broken off or covered by matrix on right side ; on left, only part 

 (inner) of t.m. 1 and 2 seen — the rest in front all hammered oif; the 

 dilated part of muzzle (inside portion) also broken off. Matrix of very 

 hard and compact .sandstone. Fossil dark reddish brown. (See PI. XV. 

 figs. 1 and 2.) 



Cerebral boite broken off. Cavity of anterior lobe of cerebrum seen 

 below (fig. 1 a), quite clean ; occipital and parietal portion broken off, 

 with the whole of temporal and parietal regions and zygomatic. Frontals 

 h V broken above ; behind, the orbits send down a process on either side 

 between lachrymals and nasals ; one concave mass between orbits, but 

 upper edge of rim of orbits broken on both sides, so that extent of con- 

 cavity concealed. Orbits evidently of large size, but rim partly broken 

 on both sides. (Frontal and orbits hippopotamine.) A foramen on 

 either side at middle of frontals at (c c). 



Lachrymal e e most perfect on right side, of a narrow oblong, let in be- 

 tween frontal apophyses and nasal above and maxillary below. Length, 

 1-2 in. ; Avidth, 4-5 in. Nasals, broad at base {d d\ conti-act into a 

 narrow muzzle forwards. Suture with maxillary bone very open on right 

 side (marked by white band,/), g gr, maxillaries long; extremities or 



' Another species of Hippopotamus 

 from the valley of the Nerbudda, with 

 six incisors, Hexa-protodon Namadicus 



l2 



(Falc. and Cautl.), is figured in the 

 Fauna Antiqua Sivalensis. See Plate 

 Iviii. fig. 1, &c.— [Ed.] 



