52 
ORIGINAL ARTICLES. 
front backwards, which it is of importance to notice with reference 
to the inferred food of the species. These steps rise like a flight of 
stairs, each being composed of the whole mass of cement of one of 
the valleys, and the combined enamel plates and ivory of the ridge 
immediately behind it. There are five of these steps in the Geor¬ 
gian specimen, the posterior ridges being intact. 
The dimensions are as follow: 
Length of crown measured at the base 9;5 inch. 
Ditto ditto at summit of crown 6.9 ,, 
Width of crown in front 3.2 „ 
Ditto at 4th remaining ridge 3.5 „ 
Ditto behind at widest part 3.3 „ 
Height of ditto at 8th plate where unworn 6.2 „ 
Ditto of anterior worn plate 2.5 „ 
PI. I. represents a longitudinal section of the specimen, by 
which the specific distinction from the Mammoth is best shown. 
The plates converge from the convex base to the summit irregularly, 
but somewhat like the voussoirs of an arch; so that the same num¬ 
ber of plates, diminishes from 9.5 inches at the base to about 7 at 
the crown. The ridges are not so high as in the Mammoth, and 
their constituent elements, i. e. the enamel, ivory, and cement are 
thicker. In the interval between the 10th and 11th ridges, the 
cement attains, near the base, the excessive thickness of six-tenths of 
an inch, being about twice as much as what is ordinarily seen in the 
section of the Mammoth. Dor the contrasted difference, I refer to 
the sections, pi. I. fig. 1, of the ‘Fauna Antiqua Sivalensis.’ 
The specimen next to be noticed is No. 33,218 of the MSS. 
register, British Museum, Palseont. Gallery. It was acquired of Mr. 
Bollaert, and it bears a record of having been procured from San 
Felipe de Austin, on the Brazos river, in Texas. It is figured in the 
‘ Geologist.’ # This superb morceau consists of the posterior three- 
fourths of the last true molar, lower jaw, left side, well advanced in 
wear. The crown presents the remains of the posterior fourteen 
ridges and hind talon ; the anterior portion had been ground down 
by use, and has disappeared. The two anterior ridges are worn to 
the base, and confluent in a common depression of ivory, upon which 
a slight islet of enamel remains. Of the succeeding ridges, the next 
seven are worn down into transverse discs, which are open, and 
bounded by highly crimped and thick plates of enamel, bearing a 
close resemblance in this respect to the corresponding teeth of the 
existing Indian Elephant. Some of the plates show a considerable 
amount of undulation in the general sweep of the machcerides , but 
there is no tendency to the mesial expansion, or outlying loop, seen 
in JE. cmtiquus. The five posterior ridges are all more or less affected 
by wear; the most of them present distinct annular discs on the tips of 
the digitations, which are seen to be of large size, as in JE. plccnifrons 
* Yol. 5. p. 57, PI. IV. 
