ENXTINCY FAMILIES 205 
Merucopotamus.—The genus Vervespotemus of the lower Phocene 
of India may be regarded as an Anthracotheroid which has lost 
the antero-median column to the upper molars 
(Fig. 112), so that these teeth are consequently 
quadritubereulate : and may thus be regarded 
typical examples of the brachy-selenodont modifica- 
tion of molar structure. 
Cofalspide.—The Miocene genus Cetileps (Ore- 
eden}) is the type of a large American family in 
which the upper molars are selenodont and usually | Fis: WA msht 
E E - Upper molar of Mery Ue 
haye four columns, while the lower canine is APprOXt- estamus 
mated to the incisors and its form and function Fliocene, India, 
assumed by the first premolar. The last upper ainaas ante: 
premolar is simpler than the molars. There is no 
flange to the angle of the mandible: and the feet have four digits. 
The aftinities of this peeuliar family are probably widely spread. 
but they may have been derived from the fnthrecctieriide, The 
type genus has the full Eutherian dentition, but in some of the 
more “specialised forms (C yelopidius) the upper incisors may be 
wanting, and large vaeuities occur in the lachrymal region. The 
g eneralised genus Preferesden, of the Upper or Uinta Eocene. has 
tive cusps on the upper molars, arranged as in the Luthrocetheriida. 
The pollex is retained in the manus of the type genus. 
The family may be divided into subfamilies as follows -—— 
I. Upper molars with four columns. 
1. Orbits open, no lachrymal fossa, a diastema, the last upper 
premolar with two euter columns, outer wall of upper 
molars coneaye and inelined inwards. —<Agrocharine 
(dorivchari.s, 
Orbits closed, a lachrymal fossa, no diastema, the last upper 
premolar with one outer column: outer wall of upper 
molars flattened.—Cotylopine Cotulops, Eporcedon, Me ve 
cocherus, Cyclopidius, eter 
II. Upper molars with five columns.—Protercentine Protoresdsn’. 
Anoploticriida. 
—This family in- 
BH. 
fe 3 some. eludes several 
gel rH Upper Eocene 
ee i . European genera. 
e =) a Vi with = selenodont 
ae BS \ upper molars, 
as ‘Y earrvinge five 
wat vine 
ASS columns arranged 
S : = 
aS Alu ays 
Fic. 113.—Restoration of Aner? therigns ooumnne ats ay Ale ens 
(Upper Eocene). Crvier. therium. One of 
1 This name (Leidy, 1551) is preoeeupied by Groves Agassiz. 1838 
