MUSEUM OF COMPARATIVE ZOOLOGY. 153 



from Canis. The American species whicL have been referred to Amphicyov 

 and Galecynus in reality belong to Cynodidis, which has the same dental 

 formula as Canis, but differs in the construction of the teeth. 



CRYPTOPROCTIDuE. 



Diaictis 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 he^ad 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 Hop)lophoneus ; 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 Cryptoproda 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) primaevus, 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 vertebrae are for the most part like those of the true cats, but with some re- 

 semblances to Cryptoproda. The scapula has a 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 

 poUex 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 -FelidcE, and a strong process for the tendon appears below the ar- 

 ticular facet. These phalanges are very diff"erent from those of Cryptoproda, 

 Dinidis, and Procelurus. 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 Dinidis, for which the name 

 Nimravidce may be retained. 



