On Some Points in the Structure of the Dicynodont Skull. 351 



does not name. He identifies what he believes to he a distinct 

 transpalatine, and the median ridge of the premaxillary he believes 

 to be part of the vomer. I have carefully re-examined the skull 

 since seeing Jaekel's book, and am satisfied that this determination 

 of the vomer is wrong, and I still think we nmst regard the paired 

 bones as the parietals and the bone round the pineal foramen a 

 neomorph. The condition of the parietals in Cistccephalus makes 

 this conclusion pretty certain. Whether there are distinct trans- 

 palatines is less clear. The condition in this skull would appear to 

 lend support to their existence, but I think the apparent sutures are 

 due to crushing. 



Later Addendum. -On one or two points which were left in doubt 

 in the above paper definite information is now forthcoming. There 

 is no longer any question that Oudenodon is the female of Dicynodon. 

 The large series of specimens of Diaclurodon tvhaitsi collected by the 

 Kev. J. H. Whaits, at Beaufort West, show that a tusk may be either 

 present or absent, and that it is pretty certainly a sexual character. 

 Another small Endothiodont obtained by Mr. Whaits at Lemoen- 

 fontein also shows tusked and tuskless specimens of certainly the 

 same species. Further, at Kuilspoort, Mr. D. M. S. Watson and 

 myself have obtained specimens of Oudenodon bolorhinus tusked and 

 tuskless. The above-described specimen will thus have to be called 

 Dicynodon kolbei. 



There is unquestionably a septo-maxillary in Dicynodon, and quite 

 a large one has been found by Mr. Watson in Lystrosaurus. 



In Endothiodon there has been discovered a distinct transpalatine, 

 and careful examination shows that in at least some specimens of 

 Dicynodon it is also distinct. It is thus probable that Jaekel is right 

 in his identification of the transpalatine. 



