ELEPHANT AND MASTODON. 125 



conical transverse mass, the summit of which is somewhat compressed, 

 and indistinctly bi- or tri-lobed, by corresponding longitudinal furrows. 

 The inner division is more massive and complex, each ridge throwing 

 out from its anterior and posterior surface — the former diagonally 

 forwards, the latter diagonally backwards — a ' col ' of robust tubercles, 

 which meet in a chevron form in the middle of the valley, so that, 

 when the inner division of the crown is regarded in plan apart from 

 the outer, it presents, in conjunction with the outlying tubercles, a 

 series of zig-zags closely resembling the letter W. The complexity of 

 pattern is further increased by the salient apex of the connecting ' col ' 

 being continued outwards towards the margin in a single line of cylin- 

 drical mammilla;, which completely obliterate the bottom of the outer 

 half of each valley ; while the inner half, corresponding with the re- 

 entering angle between the large inner cones, forms a gorge which is 

 entirely free from tubercles. The anterior talon forma a subordinate 

 ridgelet, which is thrown off in the usual manner Irom the anterior 

 portion of the inner cone, and is continued outwards towards the 

 margin, with less inclination downward than is ordinarily the case in 

 the other allied species. It is composed of about four robust com- 

 pressed tubercles, which are separated from the anterior ridge by a well- 

 marked chasm. The posterior talon consists of a cluster of indistinct 

 confluent tubercles thrown off from the posterior part of the inner 

 tubercle of the last ridge, and so adpressed to the ridge tliat it does not 

 yield the defined and separate appearance seen in the talon of Triloph. 

 angustidens. After a little wear, the posterior talon Avould be involved 

 in the disc of detrition of the last ridge. 



No. 2. — Among the teeth presented by Col. Sykes there is also a 

 small two-ridged Mastodon tooth, with very smooth enamel, which 

 in form, through every detail, agrees so exactly with a specimen of 

 Lartet's, that I unhesitatingly consider them to be homologous teeth of 

 the same side, and nearly of the same age. 



Lartet's specimen is a detached tooth, labelled in his list, ' Last lower 

 premolar, left side.' It consists of two ridges, both of them worn ; but 

 the outer and inner discs not continuous, and the middle of the valley 

 occupied by a titbercle, which is worn low down, leaving a circrtlar 

 disc. There is a well-marked anterior talon, of two worn tubercles, 

 but deeply impressed by an anterior disc of pressure against a pre- 

 ceding tooth in position. Behind, there is also a talon, but very 

 strongly impressed by a disc of pressure, so that the posterior talon 

 only exists on the inner side. The crown presents the cucumber 

 shape, so remarked on by De Blainville — i. e. the first ridge is narrow, 

 the second broad. 



The Indian fossil shows precisely the same characters — i. e. two 

 ridges worn, and two talons, with a connecting tubercle between 

 the ridges. The back talon is marked with a disc of pressure, 



