DESCRIPTION OF PLATES. 9 



includes a greater number of divisions (17 or 18) than is usual in the 

 last inferior grinder of E. Hysudricus. The specimen is now cut 

 into sections. — B.M, 



Plate VIII. 



Fig. 1. — EJephas Hysudricus. Specimen of cranium in Mr. W. Ewer's 

 collection. Shows the palate with the first and second true molars and 

 tusks on both sides ; the first well worn, and partly ground away in 

 front; the second has the first four ridges well worn. The molars 

 consist of ten ridges and a large heel ridge, eleven in all. The tusks of 

 the opposite sides do not correspond, the left being nearly circular and 

 the right oval. One large sub-orbital foramen. 



Depth from back molar to the front at top of incisives, 17'5 in. Contraction of 

 muzzle at sub-orbital foramen, 13*8 in. Breadth, outer surface maxillaries, 9 - l in. 

 Vertical diameter, left tusk, 5 7 in. Transverse diameter, 5*1 in. Greatest diameter, 

 right tusk, 6 "2 in. Least, 4'3 in. Interval between teeth in front, 2 - 2 in. Behind, 

 at niche of palate, 3' in. Length of anterior (first true) molar, 4*1 in. Width, 2"7 in. 

 Number of ridges remaining, 5 and a heel. Length of left back molar, 8 - in. 

 Width in front, 3 - in. Number of ridges, 10 and a large heel. 



Figs. 2 and 2 a. — Eleplias planifrons (misnamed E. Hysudricus in 

 plate). Very perfect specimen of lower jaw. Has three mentary fora- 

 mina on the right side, only two on the left ; none on either side at the 

 symphysis. The beak is very deep and thick, and appears to have 

 terminated bluntly. The enamel is very thick. The teeth are certainly 

 the last of the lower jaw, Avith few points to the back ridges. The slope 

 of wear inclines very much from the outside inwards, the difference 

 being nearly ^ inch, at the third ridge of the left side. The front fang 

 portion has dropped out. Nine ridges remain in the left tooth ; on the 

 right side are the remains of ten or eleven. The teeth are very broad, 

 and there is considerable mesial expansion. — B.M. 



Extreme length of right side, 24 - in. Divergence of rami behind, 21 - 6 in. Height 

 to front of alveolus, right side, 83 in. Greatest thickness behind, 67 in. Length 

 of right molar, 8'8 in. Greatest width, 3 - 8 in. Distance between the teeth in front, 

 2 - 8 in. Divergence of teeth behind, 56 in. 



Fig. 3. — Eleplias Hysudricus. Lower jaw of small-sized adult. The 

 inside only of this specimen has been figured, and only the portion from 

 the last ridge backwards as a fragment. It is a very old jaw with the 

 last molar. The anterior part of the tooth had dropped out. The last 

 ten ridges remain, all of them worn. The enamel is thick, but very 

 much crimped, and the plates are close together. The condyle is 

 broad and very convex, and the long axis, instead of being transverse, 

 runs obliquely fore and aft. The edge connecting with coronoid 

 commences immediately below the condyle, instead of sloping down 

 with a narrow neck as in E. planifrons (See Plate XI. fig. 3). — B.M. 



Extreme length of jaw, 19- in. Height of ramus to top of condyle, 17'7 in. Trans- 

 verse diameter of condyle, i'5 in. Antero-posterior diameter, 2'8 in. Greatest 

 thickness of ramus behind, 57 in. Antero-posterior extent of ascending ramus, 

 96 in. Height to alveolus, 6 - 2 in. Length of remaining portion of molar, 9*5 in. 

 Width, 3-1 in. 



Fig. 4 (and Plate XIII. A. fig. 7). — Elephas Hysudricus. Beautiful 

 specimen of entire lower jaw, with two molars. The number of plates 

 in the anterior molar is nine, with a front ridge and a small heel, inner 



