CRYPTODOXTIA. 261 



upper and back part. The sloping facial part of the skull 

 presents the same straight outline, and is of the same length, 

 viz., 4 inches, as in PL declivis ; but its breadth at the base of 

 the canine sockets is 3 inches 2 lines, beyond which they 

 slightly expand ; and the ridges of these sockets begin to 

 project nearer to the orbits.* 



FAM. — CRYPTODONTIA. 



Upper as well as lower jaws edentulous, or with inconspicuous 



teeth. 



Genus Oudenodon, Bain. 



Sp. Oudenodon Bainii, Ow. — The fossils on which this 

 species was founded are from a bluish argillo-ferrugmous 

 limestone in South Africa, and form part of a collection trans- 

 mitted to the British Museum by A. G-. Bain, Esq., by whom 

 the name| of the genus was suggested. In the species dedi- 

 cated to its discoverer, the back part of the skull, greatly 

 extended in breadth by the expanse of the lamelliform sinuous 

 masto-tympanics, inclines from above the occipital condyle 

 upward and forward, the superoccipital being continued into 

 the parietal (fig. 95, 4r) by a longitudinal channel between the 

 occipitotemporal cristae. 



The temporal fossae (ib. 7) are longer than they are broad, 

 in which respect Oudenodon more resembles Bicynodon than 

 Ptychognathus. The zygoma (ib. 26) is a long, rather slender, 

 compressed bar. The postfrontal bar (ib. 12) dividiug the 

 temporal fossa from the orbit is directed from within out- 

 ward, backward and slightly downward. The interorbital space 

 is narrower than the intertemporal one, so that the lower 

 border of the orbit has a more outward position than the 



* Quarterly Journal of the Geological Society, I860, p. 51. 

 f Ouden, none ; odous, tooth. 



