| Prof. E. D. Cope—On the Proboscidea. 443 
TETRABELODON. : DiIBELODON. Mastopon. 
1. ZT. ? brevidens. M. americanus. 
T. turicensis. M. borsoni. 
M. latidens. 
2. T. angustidens. D. shepardi. M. ? cautleyr. 
T. productus. D. cordillerarum. MM. falconeri. 
T. serridens. D. tropicus. 
T. euhypodon. M. arvernensis. 
T. longirostris. 
3. TZ. campester. D. humboldtii. M. sivalensis. 
T. pandionis. M. punjabiensis. 
i M. mirificus. 
2M. atticus. 
Parallels between the species of Emmenodon and Elephas also 
exist. As but two species of the former genus are known, we must 
look for future discoveries to increase the number of correspondences. 
The species of both genera which approach nearest to Mastodon 
have a smaller number of cross-crests, which are of lesser elevation, 
Fic. 3.—Elephas planifrons, Fale. & Cautl. Pliocene, Siwalik Hills, India. 
Vertical longitudinal section of 2nd upper true molar (3 natural size). 
a, cement; 6, enamel ; ¢, dentine. 
and whose intervening valleys are occupied -by but a shallow deposit 
of cementum. These are the Stegodons of Falconer; (1). In the 
other group (2) the crests are numerous and elevated, and their 
interspaces are filled with cementum. 
EMMENODON. : SHLEPHAS. 
1. £. elephantoides. . bombifrons. 
ganesa. 
. msignis. 
. meridionalis. 
. hysudricus. 
. antiquus, ete. 
It is observable that each type of molar teeth of the three genera 
first compared has representatives in the regions where their species 
occur: North America, Europe, and India. 
The North American species of this family are distinguished by 
the following characters of the molar teeth.” 
1 From the American Naturalist, 1884, p. 524. 
2. LE. planifrons (see Fig. 3). 
by by by by By by 
