Annals of the Transvaal Museum. 
217 
smaller opening of the vacuity was different to what I had found around 
a much bigger opening. It occurred to me that the above-mentioned 
differences might have to be attributed to the fact that we had described 
the jaws of different genera. A lower jaw of a Dicynodon was there- 
upon developed to see whether this explanation would hold good. It 
appeared, however, to be in detail exactly like the jaw of Lystrosaurus 
described above. I can therefore definitely state that the alleged 
coronoidal element between the dentary and the complementary does 
not exist ill Lystrosaurus nor in Dicynodon. My other observations 
which differ from Watson’s description are also sufficiently supported 
by proof in the above, and further discussion would only mean repeti- 
tion. I would only further draw the attention to the differences in 
the description of the dentary, the complementary, the surangular, the 
angular, and the articular.* 
* The mail just brings the latest issue of the “ Ann. and Mag. of Nat. Hist.,” London, 
ser. 8, vol. 14, No. 79, July, 1911. which contains a paper by D. M. S. Watson, “ Dicynodon 
Halli , sp. n., an Anonu'dont Reptile from South Africa.” It is herein stated on p. 97, that 
the lower jaw of this specimen served for the description of the lower jaw of the 
Anomodontia, mentione i above. Also that the apparent suture between the dentary and 
the coronoid, although clear as a very fine dark line in this specimen and several others, is 
perhaps something else. 1 would here like to refer back to my remarks on p. 2. 
