THE 



GEOLOGICAL MAGAZINE 



NEW SERIES. DECADE V. VOL. X. 



No. IV.— APRIL, 1913. 



I. — On a new Ctnodont from the Stormbekg. 



By D. M. S. Watson, M.Sc, Lecturer in Vertebrate PalEeontology in the 

 University College, London. 



WHEN I visited the town of Burghersdorp, Cape Colony, with 

 the aid of a grant from the Percy Sladen Trustees, I was 

 given by Mr. Maasdorp, the district surveyor, some fossil bones 

 which he had collected at a locality on the farm Witkop, District 

 Albert. Subsequently, through the kindness of D. V. Kannemeyer, 

 Esq., its owner, I had the opportunity of examining the spot and 

 obtained remains of Theropodous Derraosaurs, showing, as was already 

 perfectly clear from its stratigraphical relations, that the locality lay 

 in the 'Red Beds' of the Stormberg Series far above the Cynognathus 

 beds of Burghersdorp, which have yielded so many Cynodont remains. 



Fig. 1. Eight ramus of the lower jaw of Pachygenelus monus, gen. et sp. nov. 

 From the Red Beds, Stormberg Series, Witkop, District Albert, Cape 

 Colony. Nat. size. A outer, B inner aspect. 



The most important of Mr. Maasdorp' s fossils was the anterior 

 part of a small dentary belonging to an animal about as large as 

 a fox terrier. This jaw seems to be certainly a ' Cynodont ', and is 

 the second specimen of that 'Order' found at so high a horizon. The 

 specimen is represented in Fig. 1. Like all ' Cynodont ' dentaries it 

 is of a very mammalian appearance, the sole feature serving to 

 distinguish ^ it from the lower jaws of the latter group being the 

 presence of a splenial, indicated by a step on the inner side which, 

 formerly received it. The symphysis is not fused, the symphysial 

 face being well preserved and so placed as to show that the anterior 

 part of the jaw was narrow, the two rami behind it separating more 

 widely. 



The interest of the specimen lies in its very unusual dentition. 

 There are only two incisors, represented only by their roots. 1^ is 

 a large tooth of oval section, which appears to be somewhat 



DECADE v. — VOL. X. — NO. IV. 10 



