ELEPHANT AND MASTODON, 113 



confluent into a continuous disc ; all the rest except the two last are 

 more or less affected by wear ; the discs are narrow and the j^lates 

 closely approximated, showing little plaiting of the enamel and not much 

 expansion in the middle ; both these characters being inferred to be 

 owing to the veiy advanced stage of detrition. 



Dimensions. 



Inches 

 Length of specimen from anterior fracture to posterior border of 



ascending ramus . . . . . . . . 17' 



Height from plane of lower border of horizontal ramus to 



summit of fractured condyloid apophysis . . . 17'7 



Antero-posterior diameter of ascending ramus ... 8' 



Vertical height of horizontal ramus, measured to outer margin 



of alveolar border ........ 7" 



Length of crown of molar ....... 8' 



Width of ditto in middle 3-1 



This is the most perfect specimen in the collection, so far as the lower 

 jaw is concerned. 



No. 64^. Elephas Cliftii. — Fine fragment, comprising horizontal ra- 

 mus of lower jaw right side, from the middle of the symphysis on to 

 near the middle of the ascending ramus, with one finely preserved 

 molar. This tooth shows seven ridges in fiill wear, Avith about two 

 ridges broken off, discs a good deal depressed, and the enamel much 

 plaited. An interrupted basal cingulum on the outside at the extremi- 

 ties of the valleys. The diastema slopes downwards and forwards at an 

 acute angle with the inferior border of the ramus, and is a little concave 

 in its outline. Three mental foramina in a nearly horizontal line, 

 differing from what is seen in E. planifrons, the most anterior being 

 the largest. 



Inches 



Length of molar . . . . ■ .72 



Greatest width .......... 3-8 



Inferred to be the last true molar of an old animal. Presented by 

 Col. Colvin : No. 5 in his Catalogue in ' Journ. As. Soc' vol. v. p. 181. 



B. From Ava. 



No. 2. Elephas (Stegodon) Cliftii. — Fine specimen consisting of 

 the superior maxilla, right side detached, with the last true molar in 

 situ, the whole length of the alveolus shown with a small part of the 

 diasteme in front, and a portion of the remains of the penultimate true 

 molar which had been worn out. The specimen is impregnated with 

 black ferruginous infiltration, and is sparingly covered with a gritty 

 sandstone matrix : the last molar is nearly entire and in fine preserva- 

 tion, showing seven ridges and a heel : the first three ridges are well 

 worn, the most anterior being nearly ground out, and they show a con- 

 tinuous transverse excavated fossa, surroimded by a continuous more 

 or less waved belt of enamel. The 4th ridge is only slightly abraded 

 at the apices of the mammilla, and the 5th ridge is barely touched. 

 The 6th and 7th, with the heel, are quite intact. 



The plane of wearing slopes obliquely from the outside inwards, so 

 that the interior side of the first three ridges is ground down much 

 lower than the outer side. There is no mark of a longitudinal line 



VOL. I. I 



