1880 ] On the Extinct Cats of America. 847 
Dinictis squalidens. 
In this species the first lower molar tooth has but one root, 
while in the others there are two. The canine tooth of the typical 
specimen has also a very peculiar form. The crown is short and 
wide like that of a Carcharodon shark, or somewhat like that of the 
sabre-tooth Drepanodon latidens Owen. As the first true molar 
tooth of this specimen was not fùlly protruded, it is possible that 
this canine belongs to the deciduous series. 
As the tubercular tooth of the specimen on which this species 
was established could not be found in the jaw, I proposed to re- 
gard the species as typical of a genus distinct from Dinictis, re- 
marking at the time that should such a tooth be ultimately found, 
the genus would have to be abandoned. Evidence of the exist- 
ence of this tooth was afterwards obtained. Still later, another 
sabre-tooth was found with precisely the formula supposed to 
characterize this discarded genus (Daptophilus). Under the circum- 
stances I thought best to give the former a new name, Pogonodon. 
Poconovon Cope. 
This genus represents a station on the line connecting Dinictis 
with the higher sabre-tooths, being intermediate between the 
former genus and Hoplophoneus. It lacks the tubercular inferior 
molar of Diénictis, and possesses the second inferior premolar 
characteristic of that genus, which is wanting in Hoplophoneus. 
€ species is certainly known, and a second is provisionally re- 
ferred here. The two are the largest of the sabre-tooths of North 
America, the type B. platycopis equaling in dimensions the largest 
species of Drepanodon, being only exceeded among the true sabre- 
tooths by the species of Smilodon. Unfortunately only the skull 
of the typical species is known. Several bones of the P. brachyops 
have been discovered. 
P: ogonodon platycopis Cope. 
the greater part of the skeleton of the Pogonodon platycopis 
ts unknown, little can be said as to its general proportions. The 
Skull is one-sixth shorter than that of the usual size of the tiger 
oe (Uncia tigris), and is equal to the largest Brazilian variety of the 
jaguar, and is considerably larger than the Texan form of that 
: Species, E 
a -The development of the dentition is sch eotiutesd $ in the canine 
~ teeth, and the powers of destruction of the animal would seem to 
