xiii.] EDENTATA. 233 



The rami of the mandible are edentulous, very slender 

 and straight, without any angle or coronoid process. From 

 near the anterior extremity of the upper edge a sharp conical 

 tooth-like process projects upwards and outwards. The 

 condyle is a slightly expanded flattened surface, not raised 

 above the level of the rest of the ramus. 



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 lacrymal 

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

 zygoma is complete arid 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 

 epihyal 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 



