210 MEMOIRS OF THE CARNEGIE MUSEUM 
In the type under description the greater number of the foramina are well pre- 
served. With the exception of the more internal position of the stylomastoid fora- 
men *and the slightly more anteriorly placed foramen opticum, the size and position 
of the foramina are quite similar to those of Canis, which is well illustrated in Plate 
LXXY. The more internal position of the stylomastoid foramen is due to the large 
development of the mastoid process and limited backward extension of the tympanic 
bulla, while the position of the optic foramen may be due to the more advanced 
position of the orbit in Daphewnodon than in Canis. The alisphenoid canal is appar- 
ently larger in proportion than in the Oligocene genus. 
Fia. 2. Skull of young individual of Daphenodon superbus. 3 nat. size. No. 1589a, C. M. Cat. Vert. Foss. Per, 
mastoid portion of periotic; Gp, postglenoid process; J, jugal; Pl, palatine; Sy, squamosal; Pa, parietal Fol eae 
frontal; As, alisphenoid ; Os, orbitosphenoid ; J, lachrymal with foramen ; Mx, maxillary ; io, infraorbital foramen ; 
op, optic foramen ; fr, foramen rotundum ; sf, sphenoidal fissure. (Note: The occipital plate, the jugal, the nasals and 
the premaxillaries are missing and a portion of the zygomatic arch is removed in order to give a better view of the dif- 
ferent elements of the skull in this region. ) 
In Fig. 2 is given a side view of the skull of the younger individual (1589a) 
which was found together with the type. The premaxillary, nasal, malar, supra- 
occipital, and the base of the skull are slipped off and lost, but what remains 
furnishes an admirable idea of each element and their relative proportions in com- 
parison with those in Canis. It is seen that the parietal and frontal are longer, 
lower, and less convex; the alisphenoid of apparently the same proportion; the 
orbitosphenoid as long, but of less vertical diameter ; the lachrymal larger; and the 
maxillary shorter than in the recent form. From the type specimen the process of 
the premaxillary, which extends upward between the maxillary and the nasal, is 
much shorter and weaker than in Canis and in this respect more nearly similar to 
what is observed in Daphenus. 
* The stylomastoid foramen is not nearly so well separated from the large pit for the tympanohyal as is generally 
the case in recent dogs. 
