MOLAH TEETH AND OTHER REMAINS OE MAMMALIA. 
The dimensions of Ealconer’s specimen are as follows : — 
Length of the frag-ment 
Ditto of the last molar .. . 
Ditto ^ ditto excluding the spur 
Greatest width of ditto ... 
Height of posterior cones of last molar 
Length of the anterior molar 
Width of ditto ditto 
Anterior width of top of crown of last molar ... 
3-38 
2-05 
1'68 
148 
0 - 75 
1 - 20 
1-30 
1-20 
63 
Erom the two specimens, we are able to say that the dentition of the mandible 
of this species comprised three true molars, of which the last had a third lobe ; 
in front of these there were two conical premolars, in close opposition; then 
came a diastema, in front of which there was probably one premolar as in 
Anthracotlierium, or two as in Kippopotamus ; of tbe canines or incisors we know 
nothing. I should, however, imagine they were large in size, and that the incisors 
w'^ere probably three in number. Dr. Ealconer instituted a careful comparison be- 
tween the molars of his specimen and those of other genera of Suma ; he, however, 
compared them with tlie upper instead of with the lower molars. Apart from the 
premolars, which are of themselves amply sufiScient to distinguish the genus from 
all other forms of Suina, the lower molars are also very characteristic teeth ; they are 
the simplest teeth of any of the group ; their four simple cones, with the absence of a 
collection of semi-distinct tubercles, and the slight degree of obliquity of the worn 
crown, distinguish them from the molars of Sits. Erom the molars of Hippopotamus 
they are distinguished by the worn-dentine surfaces of the cones, being approxi- 
mately circular in form, and never trefoil- shaped. The lower molars of Antliraco- 
therium are distinguished from those of this species by having the inner side of 
their outer cones concave, thereby approximating to the Huminant type, by having 
an incomplete cingulum on the outer side, and by the third lobe of the last molar 
being larger and undivided. 
The gigantic size of the premolars of this genus appears to be an extension 
backwards of the ultra development of the anterior teeth which occurs in Hippo- 
potamus, Siis, Fhacochcenis and Babirusa ; in the living genera this ultra develop- 
ment is confined to the canines and incisors, while in the fossil genus it extends 
to the premolars. The premolars of this species, though formed on the same plan 
as those of Hippopotamus and Antliracotlierium, are of a more simple type, their 
summits being more regular cones, without accessary columns, and lacking the 
complete cingulum which invests the premolars of several species of Hippo- 
potamus. 
The teeth of this genus belong to a very simple and generalized type ; the true 
molars belong to the typical bumdont form of Professor Leidy, while the premolars 
are single cones of the trichecodont form of the same author. The bimodont form 
Professor Leidy regards as the earliest and least specialised type of Mammalian 
( 81 ) 
