906 



DR. E. BROOM ON THE 



The septomaxillary is entirely in the nostril, forming no part of 

 the face. 



The maxilla is long and extends far hack helow the orbit. 

 The snout is fairly broad at the root of the canine and along the 

 upper part of the maxilla, but is much narrowed in the molar 

 region. There are two foramina for the maxillary branch of 

 nerve v. 



The nasal is moderately broad in front, narrow in the middle, 

 and very broad behind. 



The lachrymal is small, but forms most of the anterior wall of 

 the orbit. 



Text-fig. 173. 



Side view of the skull of Trh'vcliodon Tcannemeyeri. The drawing is chiefly founded 

 on the crushed and immature skull which forms the type. Two mature 

 and uncrushed hut imperfect skulls in the Albany Museum and a good snout 

 in my own collection have made it possible to correct the cru.shing of the type 

 and completely restore the skull in the adult condition. 



The prefrontal is about twice as long as broad, and forms most 

 of the upper margin of the oi-bit ; it unites, as in Cynognathus, 

 with the postorbital, completely shutting out the frontal from the 

 orbital margin. 



The frontal is fairly like that of CynognatJius, but it does not 

 extend so far forward. Posteriorly, as in the former genus, it 

 tapers away between the postorbitals. 



The postorbital is more like that of Nythosaurus. It forms the 

 upper third of the postorbital arch, luiiting with the jugal. It 

 extends backwards on the side of the parietal a little beyond the 

 pineal foramen. 



The parietal is like that of Cynognathus, but the pineal foramen 

 is much smaller. 



The jugal is, on the whole, like that of Cynognathus. It has, 

 however, the inferior process much better developed. It forms 

 the lower and posterior half of the orbital margin. 



The squamosal differs from that of Cynognathus in not meeting 

 the postorbital, but ending in front above the jugal, very much as 



