74 



MEMOIRS OF THE CARNEGIE MUSEUM 



canidse and in general form it resembles more nearly that which obtains in the 

 fehdse than in the canidse. Seen from below the general shape of the ^promontory is 

 pyriform with the expanded end directed posteriorly and externally and the apex 

 looking anteriorly and internally. The inferior surface of the 'proiriontory is convex 

 in all directions as in the cats and not so much flattened as in the modern dogs. 

 The /enes^ra rotunda opens downward, outward and backward, and is more canine 

 than fehne in character. The foramen or fenestra ovalis looks directly outward 

 toward the groove between the post-glenoid and mastoid processes, but is situated 



Fig. 3. Inferior view of basicraaial region of skull of Dnpliwtius felinus (No. 492). f.t., fragment of tympanic ; 

 as., posterior opening of alisphenoid ennal ; f.o., foramen ovale ; p.gf., postglenoid foramen ; f.l.m., foramen lacerum 

 medium; fe.o., fenestra ovalis; pr., promontory; /.»■., fenestra rotunda; sm.f., stylomastoid foramen;,/./., jugular 

 foramen ; c.f., condylar foramen ; r.f., reniform fossa. 



high above the roof of that groove. The inflated nature of the promontory indicates 

 that the cavity of the internal ear was capacious and the cochlea correspondingly 

 well developed. 



In neither of our skulls is the basicranial region sufficiently well preserved to 

 determine with certainty the position or character of all the foramina of this region. 

 In No. 492, however, the following foramina may still be detected and are shown in 

 Fig. 3. The condylar foramen perforates the exoccipital at the usual place just 

 within the base of the paroccipital process. The foramen lacerum posterius occupied 

 a position on the postero-internal side of the auditory bulla. The postglenoid. fora- 



