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MUSEUM OF COMPARATIVE ZOOLOGY. 153 
from Canis. The American species which have been referred to Amphicyon 
and Galecynus in reality belong to Cynodictis, which has the same dental 
formula as Canis, but differs in the construction of the teeth. 
CRYPTOPROCTIDA. 
Dinictis felina, Leidy. This genus has usually been placed in the same 
family with Hoplophoneus ; but the materials now at command show that it is 
quite distinct, and more nearly allied to the recent Madagascar form Crypto- 
procta. There are several cranial and skeletal fragments in this collection 
which are of much interest. The radius has the same shape as in Hoplopho- 
neus, with a concave disk-shaped head and expanded distal end, The tibia 
has a very much flattened astragalar facet, and the astragalus has not such a 
deeply grooved trochlea as in Hoplophoneus ; the phalanges of the second row 
have an excavation on the outer side, showing that the claws were retractile. 
A very fine specimen in the Princeton Museum, of which an account will 
shortly be published, brings out the resemblance to Cryptoprocta very clearly ; 
as in that animal, the foot is pentadactyl and completely plantigrade, and the 
ungual phalanges were simple, compressed, and without bony hoods. 
NIMRAVID&.* 
Hoplophoneus (Drepanodon) primevus, Leidy. Numbers of fine spe- 
cimens of this species are preserved in the collection, which with some of the 
Princeton material enable us to give a restoration of this very interesting type. 
The vertebre are for the most part like those of the true cats, but with some re- 
semblances to Cryptoprocta. The scapula hasa prominent spine, with acromion 
and metacromion, The humerus is remarkable for the great prominence of 
the deltoid ridge ; there is a very prominent internal condyle and large epicon- 
dylar foramen ; the trochlea is like that of the true cats. The ulna and radius 
are essentially feline, and need no especial description. The carpus is also 
feline, but has a small vertical diameter; the scaphoid and lunar have coalesced 
(the first case reported from the White River formation), though the line of 
junction is still clearly visible. The metacarpals are five in number, the 
pollex very much reduced, and the other digits small and slender, The un- 
gual phalanges show an unexpected degree of specialization ; they are com- 
pressed, curved, and have a large lamina of bone reflected over their base as in 
the higher Felidw, and a strong process for the tendon appears below the ar- 
ticular facet. These phalanges are very different from those of Cryptoprocta, 
Dinictis, and Proelurus. The pelvis is in general like that of the Cryptoproc- 
* If Cope’s definition of this family (Tert. Vert., p. 948) be accepted, Hoplo- 
phoneus cannot be included in it. We do not consider, however, that the absence of 
the hallux is a good family character, while the foot structure of Hoplophoneus shows 
that it should be placed in a separate family from Dznictis, for which the name 
Nimravide may be retained. 
