60 General Notes. 
era with three and two superior premolars in the sub-order 
muroidea, although the foot structure of these extinct genet 
yet unknown. I also inadvertently defined the Lemurot 
having quadrituberculate superior molars, a character whit 
well knew to be wanting in various extinct and recent § 
. where they are tritubercular. Two families we re propose 
Eocene lemuroids, which are defined as follows: 
Superior premolars three...... hin seen ee os a as AI 
Superior premolars two...........- Spe a ea epee en caer we eee Anapto 
The genera of the first named family are defined as fol 
I. Canine teeth large and lateral; well separated, 
First superior premolar without internal lobe ; superior true molars trituberct 
cingula +e eseee ee ice bale abel bald cd we OER NO Wes eee eee 
II. Canine teeth median in position or much reduced in size. | 
a, Last inferior premolar without internal tubercle. ! 
Inferior premolars all one-rooted. nine and incisor small, e...» 
First premolar only one-rooted; canine small; incisor very large....+++ 
aa, Last inferior premolar with internal tubercle. 
A very large ? canine; first premolar only one-rooted......-+++++ eo eed 
A very large ? canine; first and second premolars both one-rooted.. . Cyn 
open behind. | 
The genera of Anaptomorphidz, which on dental c 
includes Indrodon, differ as follows: 
5 a. Incisors three. ; } 
First superior | pared without inner lobe; posterior inner tubercle presen 
and second superior true molars ‘i seer ee 
aa. Incisors two, 
conic and acute, and are connected with the internal 
ridges which form a V. Posterior inner cusp disting 
and 11, a part of the posterior cingulum. Intermediate 
! Filhol Rech, Phosph, Quercy. ‘ 
. Proceedings American Philos. Society, 1883, p. 559- 
* Leidy, Report U. S. Geol. Survey Terr., 1. 
t Cope, Pal. Bull., No. 34. a 
oie uae 
f 
