DESCRIPTION OF PLATES. 



41 



side, showing third milk molar with 5 ridges and an anterior and 

 posterior talon. The three anterior ridges are worn into a common 

 disc. 



Length, 3-6 in. Width in front, 1*4 in. Width behind, 1-8 in. 



Figs. 6 and 6 or. — Elephas bombifrons. Fragment of lower jaw, right 

 side, with the antepenultimate or first true molar, presenting 7 ridges 

 and a heel. — B.M. 



Length of molar, 5 - 9 in. Width in front, 2 - l in. Width at antepenultimate 

 ridge. 27 in. 



Figs. 7 and 7 a. — E. bombifrons. Last molar, lower jaw, left side, 

 presenting 9 ridges and a heel ; 8 front ridges abraded. — B.M. 



Extreme length. 13 - 4in. Extreme breadth of crown, 4 - 2 in. Breadth at 

 posterior ridge, 3 - 2 in. Breadth of grinding surface, 3 - 2 in. Extreme height, 

 6-4 in. 



Figs. S and 8 a. — Elephas insignis. Fragment of lower jaw, right 

 side, with portions of penultimate and last true molars. Shows 4 ridges 

 and a large posterior talon of penultimate, and 3 ridges and anterior 

 talon of last molar. Two large outer mentary foramina. — B.M. 



Length of grinding surface of penultimate, 6 - 3in. Extreme breadth posteriorly, 

 3'7 in. Breadth across anterior ridge, 3'2 in. 



Plate XXX. 



Figs. 1 and 1 a. — Elephas Cliftii 1 (Falc. and Caut.). Mastodon 

 Elephantoides of Clift. Palate, with third upper milk molar, and the 

 three anterior ridges of the antepenultimate or first true molar. 2 The 

 third milk molar is entire on one side, but worn down to the common 

 base of ivory, so that the divisions of the crown have entirely dis- 

 appeared, leaving no certain data for determining the ridge formula. 

 Behind it the three anterior ridges of the antepenultimate true molar 

 are seen in situ, the posterior half being broken off. The plane of the 

 palate, on to the diasteme, is veiy flat. The mesial line of division of 

 the ridges in first true molar is not very distinct. This very interest- 

 ing specimen was brought from Ava by Colonel Burney, and presented 

 to the British Museum. 



Extreme length of fragment, 10'6 in. Length of anterior tooth, 3 - 3 in. Width, 

 2- in. Length of second tooth, 3 - in. Width, 3 - 4 in. Interval between teeth in 

 front, 3-2 in. 



Figs. 2 and 2 a. — E. Cliftii. This is the first or antepenultimate 



1 Mr. Clift, in his excellent memoir, 

 includes the Ava fossil Proboscideans 

 under two species. Mastodon latidens 

 and Mastodon Elephantoides. In the 

 ' Eauna Antiqua Sivalensis,' the for- 

 mer name is retained for the speci- 

 mens of the Tetralophodon type, figured 

 by Mr. Clift in the Geol. Trans., vol. ii. 

 2nd ser., Plate xxxvii. figs. 1 and 4; 

 Plate xxxviii. fig. 1 ; and Plate xxxix. 

 figs. 1. 2, and 3. Of the others, the pa- 

 late specimen, Plate xxxvi. {Mastodon 

 latidens, Clift), together with the de- 

 tached molar, Plate xxxviii. fig. 6 (Masto- 

 don Elephantoides, Clift), are referred to 



E. (Stegodon) Cliftii; and the lower jaw 

 specimen, Plate xxxviii. fig. 2 (also M. 

 Elephantmdes, Clift), is referred to E. 

 Stegodori) insignis. The specimens re~ 

 gardedbyhim as of his M. Elephantoides 

 being here considered to belong more 

 properly to the genus Elephas, it became 

 necessary to resort to another specific 

 designation. Hence the origin of E. 

 (Stegodon) insignis. — H.F. 



2 In the Museum of the Royal College 

 of Surgeons (Cat. No. 664) is another 

 fine palate specimen of E. Cliftii with 

 the penultimate and last true molars on 

 both sides. 



