SIWALIK MAMMALIA 
17 
exhibited by the reentering angle formed by the anterior termination of the nasals, 
the backward position of the fronto-nasal suture, and the general contour of the 
facial aspect of the cranium. 
Mandible. — The right ramus of the mandible of a male of this species figured 
by Falconer and Cautley in the “Fauna Antiqua Sivalensis,” pi. LXVII. figs. 4, 4a, 1 
is refigured on a larger scale in pi. V. fig. 3. The length of the space occupied by 
the three true molars is 3-45, the interval between the canine and the hinder border 
of mT3 7*8, and the antero-posterior diameter of the canine 1T5 inches; these 
dimensions agreeing very closely with those of the male cranium. The hippopotamine 
features presented by this specimen have been described in previous notices. 
There are no complete specimens known of the mandibular ramus of the female 
of this species ; and it is very difficult to make specific determinations in the case of 
imperfect specimens. The left half of a symphysis has been referred to a female in 
the “ Cat. Foss. Mamm. Brit. Mus.” pt. II. p. 211. No. 18444, and it is not impro- 
bable that the immature specimen No. 17002 noticed on the same page may also 
belong to this sex. The hinder part of a right mandibular ramus from the Punjab 
figured in pi. VI. fig, 3. agrees with the latter specimen, and also accords in size with 
the female cranium figured in pi. V. fig. 2. The third true molar is narrower than 
the corresponding tooth in the jaw of the male of the present species, and in the 
two figured jaws of M. nanus (pi. YI. figs. 4, 5). 
Distribution. — A young cranium from Burma is referred to this species in the 
“Cat. Siwalik Vert. Ind. Mus.” pt. I. p. 38. No. B. 112, and the range of the 
species seems therefore to have extended from the Punjab to Burma. 
Species 2. Merycopotamus nanus, nobis. 2 
Characters. — This species is smaller than the last, and is characterized by the 
narrower mandibular symphysis, the relatively shorter jaws, the convex profile 
and great vertical depth of the cranium, the absence of a deep fossa behind the 
lower canine of the male, and the deep concavity of the outer surface of the third 
lobe of mTB. The canines are of great relative size. 
Cranium.— The cranium of a male of this species figured in the “Fauna 
Antiqua Sivalensis,” pi. LXVII. figs. 3, 3a, 3 is refigured on a larger scale from the 
palatal aspect in pi. VI. fig. 1 of this memoir. The length of the space occupied by 
the three true molars is 2-6, the interval between the canine and the hinder border of 
m. 3 5-55, and the antero-posterior diameter of the canine 086 inches. Contrasting 
this figure with that of the female cranium of M. dissimilis (pi. V. fig. 2), the 
characteristic shortness of the jaw is well exhibited, and this would be still more 
marked if the male cranium of which the cheek-dentition is represented in pi. V. 
fig. 1. were sufficiently complete to exhibit the whole of the dental series. 
A female cranium is figured on a scale of one- third in the 1 £ Fauna Antiqua 
1 Also in pi. LXII. fig. 16, on a scale of 
2 < Geol. Mag.’ dec. 3. vol. I. p. 545 (1884). The specimens of this species figured in the “ .fauna Antiqua oivaiensis,” 
were all referred to M. dissimilis. 3 See “ Cat. Foss. Mamm. Brit. Mus.” pt. II. p. 211. No. 16551. 
