xiii.] EDENTATA. 209 



In the Cape Anteater {Orycteropus) the skull is moderately- 

 elongated and dilated in front of the orbits. The facial por- 

 tion is subcylindrical and slightly tapering. The lachrymal 

 forms a considerable part of the side of the face. The 

 zygoma is complete and slender. There is a small post- 

 orbital process. The premaxillae are short and widely 

 separated from the frontals. The palate ends posteriorly in 

 the thickened transverse border of the palatines, and is not 

 continued back by the pterygoids. The tympanic is annular, 

 and not ankylosed to the surrounding bones. 



The mandible is slender anteriorly, but rises high pos- 

 teriorly, with a slender recurved coronoid, and an ascending 

 pointed process on the hinder edge below the condyle; 

 which is small, oval, and looks forwards as much as up- 

 wards. 



The hyoid arch is completely ossified. The basihyal 

 is a thin bar, narrow in the middle. The thyrohyals are 

 not ankylosed to it. The ceratohyals are thick. There is 

 a small (apparently epiphysial) ossification between the epi- 

 hyal and the stylohyal. 



The Three-toed Sloths (genus Bradypus) have a high 

 compressed skull, and an extremely short face. The cranial 

 cavity is oblong, and rather high and compressed. There is no 

 fossa on the periotic for the flocculus. The olfactory fossae 

 are large. The plane of the occiput is vertical, or sloping 

 slightly forwards and upwards. The frontal region is dilated 

 with air sinuses. There is a small postorbital process. 

 The lachrymal is very small, and the canal is external to 

 the margin of the orbit. The malar is attached to the 

 frontal, lachrymal, 'and maxilla in front, curves downwards 

 and outwards, and then divides into a descending and a high 

 ascending branch; but neither of them join the straight 



