SIWALIK AND NARBADA BUNODONT SUINA. 59—93 
4. 
Hyotherium platyops (Cope^). Miocene, N. America. 
Palaochcerus platyops, Cope. 
Said to be the largest species of the genus, but is yet unfigured : pm- 4 is remarkably 
elongated ; and m- t narrows internally. 
Hyotherium scemmeringi, H. von Meyer.^ Mid. miocene, Europe. 
ChceromoriLS mammilatus, Gerv. {teste Peters). 
(?) Choerotheriiun dupuiip Lart. (?) in parte. 
Chcerotherium sansaniense, Lart. {teste Peters). 
Sus antediluvianus, Kaup {aptid Plain). 
Sus chcerotherium, Plain., in parte. 
Sus scemmeringi. Plain. 
6 . 
The largest European species ; of which the molars are of a complex structure, 
approaching those of Sus. 
Hyotherium sub^quans (Cope'‘). Miocene, N. America. 
Palceochcerus stibcequans. Cope. 
An unfigured species, said to be about the size of Dicotyles tajacu : a distinct cingulum 
on outer side of upper molars. 
*7. Hyotherium suillum (Porn.). Low. miocene, Europe. 
Palceochcerus suillus, Pom. (?) Amphichcerus typus, Prav. 
This species was formed by Pomel on the evidence of a skull in the Pritish Museum 
(No. 34,96 1 ),5 and is said to be one-third smaller than H. typus. Dr. Filhol,® however, 
provisionally refers this specimen to the latter species ; but he regards the lower jaw 
figured by Gervais under the name of P[. typus, as really belonging to that species, 
whereas Peters has shown that it is probably distinct, ^ and smaller than the proper 
jaw of that species. Poth the former specimen and the Pritish Museum specimen 
may, therefore, possibly belong to the same species, which will then be distinct from 
H. typus and may retain the name H. suilluin. 
8. Hyotherium typus (Pom.). Up. eocene to low. miocene, France. 
Chceromorus simplex, Gerv.8 {teste Peters). Palceochcerus typus, Pom .9 
A species of about the same size as H. meissneri. The crowns of the upper true molars^® 
are nearly square, with very simple columns. The lower jaw figured by Gervais^^ 
under the name of Chceromorus swiplex has been shown by Peters to probably belong 
to this species. *2 mandible from Quercy figured by FilhoP^ under the latter name 
may likewise be referred to this species. 
1 ‘ Bull. U. S. Geol. Surv.,’ vol. VI., p. 174. 
2 “ Georgensmund,” loc. cil.\ Peters, op. cit., p. 196, pis. I., II. The synonomy is mainly taken from the latter 
memoir. Faloeochcerus mnjor, which Peters refers to this species, is, however, on the authority of Dr. Pilhol, referred to H, 
watei housi. 
3 Identified by Gervais both wih his O. mammilatus and Sw chcerotherium. 
4 ‘Pro. Amer Phil. Soc.,” vol. XVIII., p. 374, 1879. 
5 A canine of Amphitrogulus or Bremotherium is inserted in this skull. 6 ‘ Ann. Sci. Geol.,’ vol. XI., p. 14. 
7 Peters proposed to restrict the term H. typus to this jaw, which only adds to the confusion. If H. meissneri and H 
typus are identical, the latter name should be at once abolished. 
8 Op. cit., pi. XXXIII., fig. 5. 9 ‘ Bull. Soc. Geol. France,” 2nd ser., vol. IV., p. 381, pi. IV., fig. 1 (1846); 
10 Gervais, op. cit., pi. XXXIII , fig. 1. Gaudry, “ lies Enchainements— Mam. Tert.,” fig. 83. 
11 Op. cit., pi. XXXIII., fig. 5. 
12 That the lower jaw referred by Gervais to H. typus is too small for the upper teeth of that species may be seen by 
comparing the relative dimensions of these teeth with those of II. walerhousi figured by Dr. Filhol, and referred to below. 
13 “ Phosphorites du Quercy ” (reprint), p. 391, fig. 292. 
P 
