480 PURTHEE EYIDENCE OF ENDOTHIODON BATHYSTOMA. 



Like so many of the South African fossil bones, this jaw is in- 

 vested with a layer which seems to me to be the remains of the 

 original skin. This layer has been left upon the bone. 



The form of the articular condyle indicates a difference from 

 Dicynodontia and all other Anornodontia hitherto described, which 

 implies that the quadrate bone was inclined obliquely forward. 

 This character is probably as important in defining the sub-order 

 Endothiodo7itia as the condition of the teeth, which may only 

 distinguish the family Endothiodontidce. But all the characters of 

 the dentition suggest near affinity with the Theriodontia. 



Discussion. 



Mr. Htjlke bore testimony to the great value of Prof. Seeley's 

 two communications. The skull, so far as shown by the present 

 form, appeared distinct from all South African forms yet known to 

 him ; but he would speak with diffidence as to its generic distinct- 

 ness, because the frontal plate and snout, and also the occipital 

 region, were mutilated, and the specimen had suffered from wear, 

 weathering, and compression. As the Author had noticed, the very 

 large size of the parietal foramen was remarkable. The defective 

 condition of the surface made it difficult to trace the sutures, and 

 thus there must be uncertainty respecting the form and relation of 

 the several anatomical elements constituting the skull, and yet in 

 these lie the characters which determine the affinities and zoological 

 position of the animal. 



The lower jaw referred to EadotModon was also extremely in- 

 teresting. The teeth were more perfect than any before known to 

 the speaker. There was one small matter to which he would direct 

 attention : the upper teeth occur in rows, separated by rather 

 wide intervals ; in the lower jaw the several rows of teeth occur in 

 closely ranged series, not separated by intervals corresponding to 

 those between the upper teeth. 



The AuTHOE said he was unable to detect any evidence o£ crushing 

 or distortion of the occipital region of the skull of Delphinognathus, 

 and he believed the state of the specimen warranted the interpreta- 

 tion which had been given in the paper. 



He accepted the association of the lower jaw with the skull of 

 Endothiodon, figured by Sir R. Owen in his South African Catalogue, 

 on the testimony of the gentleman who collected the specimens, and 

 was aware of a degree of difference in the superior and inferior 

 dentition. 



