INSTITUTE OF SCIENCE, PHILADELPHIA. 43 



roughened, extending to the fore part of the malar crest, instead of being 

 smooth. 



The masseteric groove beneath the zj'goma is more conspicuous, being 

 longer, wider and deeper than in Dicotyhs labiatiis, indicating larger mas- 

 seter muscles, to compensate for the smaller temporals, than in the latter. 



The deptli of the face below the anterior abutment of the zygoma is 

 very much greater than in Dicotylcs labiatiis. The deep fossa in the latter, 

 below the malar crest in ad\ance of the masseteric groove, is represented by 

 a shallow impression in Platygomis. 



The infra-orbital foramen is placed above the last premolar, intermediate 

 to the position it occupies in Dicotyhs labiatiis, and D. angiilatiis. A fora- 

 men at the fore part of the fossa, into which the former opens, extends as 

 a canal above the alveolar border of the jaw. 



The muzzle of Platygomis is not only longer and more tapering than in 

 Dicotylcs labiatiis, but is of more uniform thickness transversely from above 

 downward. It is especially prolonged in advance of the position of the 

 molar teeth, the hiatus between these and the canines being ver}' much 

 greater. The top, formed by the nasals, is more regularly demicylindrical 

 or less flattened, and turns more down at the end, which is much narrower 

 and tapering. 



The remarkable process of the canine alveolus is more conspicuous than 

 in the Peccaries, having a considerably greater size than in Dicotylcs labiatiis, 

 though tlie canine teeth are smaller. Its upper extremit)- is more produced, 

 and reaches to about the middle of the position of the lateral nasal notch, 

 whereas in the Peccaries it is more posterior in relation with the latter. 



The premaxillaries are narrower and more tapering than in the Peccaries. 



The occipital region or inion closely resembles that of Dicotylcs labia- 

 tiis, except that its upper part is of greater relative width compared with 

 the lower part, and has a comparatively thin, delicate border instead of the 

 thick, rough one of the latter. 



The basi-occipital region conforms to that of the Peccaries. The basilar 

 process is much more strongly marked, and its fore part is produced with 

 a conspicuous pair of tuberosities instead of the shallow, roughened emi- 

 nences of the latter. The paramastoid processes, auditory bulls, and occi- 

 pital condyles have the same character and the contiguous foramina the same 

 relationship as in the Peccaries. The guttural region does not exhibit the 

 narrow, contracted condition of the latter, but a remarkably inflated arrange- 

 ment. The basi-sphenoid turns up almost at a right angle from the basi- 

 occipital, and with the pre-sphenoid cur\-es forward and produces a deep 

 carina articulating with the vomer. On each side of this, included bv the 

 pter\-goids, the sphenoid forms a pair of capacious, deeply concave recesses, 

 opening forward into the nares ; a condition which is an exaggeration of 

 that in the same position of the Peccaries. Further, between the nares and 



