914 



DR. R. BROOM ON THE 



length, but is chiefly remarkable in being narrower behind than 

 in front. In all other Cynoclonts except Bauria the nasal is, as in 

 Marsupials, much broader posteriorl3^ 



Text-fig. 179. 

 Fr. 



Side view of slcull of Sesmnodon hroiv7ii. Somewhat Ifestoi'ed fvohi the oiilj' known 

 specimen, which forms the type. The whole of the preorbital portion of the 

 skull except the front of the premaxilla is preserved in the specimen, though the 

 bone in parts is weathered off, leaving only the impression. Though the teeth 

 are imperfect, remains or impressions of all are present, so that the full dentition 

 can he restored with much 'certainty, the only doubt being the exact length of 

 *the incisors and canines. The orbit and the temporal fossa are satisfactorily 

 preserved, and the squamosal is fairly well preserved on the right side of the 

 skull. The lower border of the jugal is unknown. Both mandibles are in 

 position but much weathered. The horizontal ramus is fullj' known, but much 

 of the ascending ramus is lost. As, however, the top of the coronoid process is 

 preserved in position, the greater part of the dentarj' can be restored with 

 certainty. The condylar process is badly preserved. A considerable part of 

 what is believed to he the angular alid probably part of the articular ai-e 

 preserved. As the position of the glenoid cavity is known, the general shape of 

 the back of the jaw can be restored with some probability. 



The lachrymal is small and completely separated from the nasal 

 by the prefrontal. In this, Sesamodon again agrees with Bauria 

 and difiers from all other known Cynodonts. 



The prefrontal is much larger than the lachrymal and meets the 

 frontal, nasal, maxilla, and lachrymal as in Bauria. 



The frontal is almost completely lost from the specimen, but 

 just sufficient of the impression of the bone is left to show that it 

 reached the orbit as in Bauria. In this also, Sesamodon difljers 

 from almost all other known Cjmodonts. 



The postorbital is fairly large but slender. It forms with a 

 small part of the jugal a complete postorbital arch. It only 

 extends backwards on the parietal a very short distance. 



The parietal is completely lost except just suflScient to show 

 the width of the bone. 



The jugal is not well preserved except in the upper part. It 

 forms the whole of the lower orbital margin and part of the 



