7—148 
SIWALIK SELENODONT SUINA, ETC. 
In typical members of the family the feet were furnished with four digits, but 
in some of the earlier species of Hyopotamus, like H. renevieri and H. gresslyi 
it seems probable that the number of the digits was reduced to two, in which case 
these forms ought to be referred to a distinct genus. Another well defined didactyle 
form, of which the teeth are unknown, has been referred to a distinct genus, under 
the name of Diplopus aymardi, and, as already said, probably belongs to a distinct 
family. 
Genus I : ANTHRACOTHERIUM, 1 Cuvier. 
Characters . — With the addition of the new species described in this memoir it 
is difficult to formulate dental characters which will satisfactorily distinguish this from 
the next genus. It may, however, be noted that the lowness of the columns, the 
shallowness of the valleys, the smallness of the outward proj ections of the angles of 
the outer surface, and of the loop connecting the outer columns, are characteristic 
points of the more typical forms. In some forms the whole of the upper premolars 
are approximated to the true molars, while in others the earlier premolars are 
separated from the posterior teeth. 
Distribution . — As regards distribution in space, remains of this genus have been 
obtained from Europe and India. In time the genus in Europe, took its origin, 
according to Professor Albert Gaudry, 2 3 in the upper eocene (7th tertiary stage of M. 
Gaudry), attained its maximum in the lower miocene (9th stage), and disappeared in 
the middle miocene (11th stage). In India its earliest known occurrence is in the 
(probably) earlier pliocene, and it may possibly have survived into the higher 
pliocene. 
Number of Species . — The following list contains the names of the best known 
species, but, as M. Filhol observes, there is a great variation in the size of the molars 
of many of the so-called species, which would lead to the inference that many of 
them should rather be regarded as races. 
1. Anthracotherium alsaticum 3 Cuv. Up. eocene and Low. miocene ; Europe. 
A alsatiacum, Blain. 
2. Anthracotherium breviceps, 4 (Troschel). Low. miocene ; Europe. 
Sus breviceps , Troschel. 
3. Anthracotherium cuvieri, 5 Pomel. Miocene ; Europe. 
A onoideum , Gervais. 
4. Anthracotherium dalmatinum 6 Myr. Low. miocene ; Europe. 
5. Anthracotherium hippoideum 7 Rut. Low. Miocene ; Europe. 
6. Anthracotherium hyopotamoides si Nobis. Earlier pliocene (?) ; India. 
1 From anthrax, coal, and pterion, an animal : so named from the occurrence of its remains in the hrown coal of the continent. 
2 “Les Enchainements du Monde Animal,” p. 4. I follow- this classification, not using the term “ oligocene.” 
3 Filhol “ Phosphorites du Quercy,” pi. VIII. —Gervais “Zoologie et Paleoutologie Generates, ” Vol. II., pl.X., fig. 1. 
4 “Palaontographica,” Vol. XXIV., p. 165. 
5 Blainville “ Osteographie,” Anthracotherium, pi. III. (A magnum de's Orleanais). 
6 “ Palaontographica,” Vol. IV., pi. XI. 7 ‘ Nov. Mem. Soc. Hel.,’ Vol. XV., pi. I. 
8 Vide infra. 
