PART 1.] 
h/dekker : Notices of Siwalik Mammals. 
81 
genera. There are no unworn molars from Sind which I can refer to Meryco- 
potamus, but it is just po.ssible that certain much-worn molars may really 
belong to it. 
Genus: Sus. 
Of this genus two species, 8. gigantem and 8. hysudricus, have already been 
named from the Siwaliks ; another species (8m pusillus) was made by Dr. Fal¬ 
coner from the lower jaw of 8anithermm schlagintweitii. Among Mr. Theobald’s 
Siwalik collection from the Punjab there are two fragments of mandibles of a 
species of 8us which are so small that they cannot possibly have belonged to 
Sus hysudricus, which is the smallest of the named species. The most pei’fect 
of the two specimens is a part of the left ramus of the mandible containing the 
three true molars of the permanent dentition, which prove that the specimen 
belonged to a fully adult animal. The teeth of the species of the genus Sus are 
so like one another in form that it is generally impossible to tell one species from 
another by the teeth alone; except in the matter of size I cannot distinguish 
betw'een the teeth of the small specimen and those of 8. hysudricus, though the 
accessory tubercles in the outer valleys of the last molar seem to be somewhat larger 
in the former. The discrepancy in the size of the present specimen and of the jaw 
of 8. hysudricus is, however, so great, that on this evidence, alone I have referred 
tbe two specimens in question to a new' species, for which I propose the name of 
8. punjahiensis; the species is, I believe, the smallest of the genus. Below I 
have given the dimensions of the specimen, and have added for comparison the 
corresponding dimensions of the smallest specimen of the lower jaw of 8. 
hysudricus which i.s contained in the collection of the Indian Museum;— 
S. punjabienn^. S. hyaudricnn. 
Jjength of three true molars » 
. 1-46 
2-35 
,y of last molar . . ; 
. 0-61 
1-19 
Width of „ y, . . i 
, 0-38 
0-65 
Length of penultimate molar . 
. 0-49 
0-70 
Width of „ ,, , 
. 0-35 
0'55 
Length of first molar . , ^ 
. 0-32 
O-nO 
Width of . 
. 0-29 
0-45 
Depth of jaw at last molar ; 
. 0-69 
170 
Sus giganteus, Falc. 
Prom the red and gray Siwalik sandstones of Niki in the Punjab, Mr. Theobald 
has sent a veiy magnificent cranium of this species, which is the largest and 
most perfect yet obtained. The lower jaw is attached to the cranium, and the 
whole of the dental series is complete; in fact, the only noticeable damage that 
the specimen has received is a certain amount of lateral squeezing. 
This cranium was obtained from the deposit which I have already referred to, 
in which were buried such a vast number of bones in a small area; to the left 
side of the cranium of the pig was attached a cranium of a young Mastodon, 
which was necessarily somewhat damaged in the extraction of the foi'mer, while 
between the rami of the mandible was fiT-mly fixed the head of a large Ungulate 
L 
