o NNE EEEE ETE = ENEE SS 
Ea a gee ee O 
MESES ko NET PO agent ee ey ee me ee ee E nee a - 
1884.] The Condylarthra. 803 
like angle is flanked in front and behind by a cingular ridge, 
which is homologous with each accessory internal cusp of Perip- 
tychus. There are two species of the genus. The type, #. 
howalevskianus, is about the size of the Virginian opossum, and 
is abundant. Its premolars are robust and conical (Fig. 11 ô). 
In Anisonchus the posterior cingulum of the superior true 
molars supports an accessory cusp, and there is no anterior cingu- 
lum or cusp. The normal inter- 
nal cusp is, as in the two allied 
genera, the apex of a V, whose 
branches terminate close to the 
two external cusps. The supe- 
rior premolars three and four, have 
internal cusps whose different 
forms distinguish two sections of 
the genus. In the type, A. secto- 
nus Cope (Fig. 12 a 4), the form 
is, as in the known species of Per- 
iptychus and Ectoconus, that of _3 
an elevated concentric cingulum ; 
While in the A. coniferus, (Fig. 12 ¢) 
and A. gillianus, it is conical. The 
A. coniferus is the largest species, 
Probably equaling the wolverine 
in size, while the A. gillianus Cope, 
S not larger than the Bassaris 
astuta, The A. sectorius is an 
abundant species of the Puerco 
ae Ze teeth are smaller than 
of a placental mammal of iptychidze, nat. * 
corresponding size, and the cran- ler ect ta = — 
um is produced posteriorly, and part of nak aa a’, same, 
'S narrowed posterior to the orbits. external view. Fig. 4, right othe 
Ithas a well-marked sagittal crest. martapa peine er tate 
Its length is about that of the side. rie ei ‘Anisonchus conif 
Pe o from below. 
skull of the red fox. Two other ,CoPeright impet rie 
Supposed species of Anisonchus New Mexich.s od. a 4 
Were not larger than squirrels. Te 
$ ea figure is made by combining portions of oppos 
original (Report U. S. Geol. Surv. Terrs., 11, Pl. XXIV S, 
n 
ite sides of the same skull. 
Fig. 6) the artist 
' duplicated one of the tooth bases, an error which is now corrected. 
YOL xvi, —yo. vir. 
Ca 
