260 Transactions of the Boyal Society of South Africa. 
is cylindrical and tapers gradually from the base of the crown. It was 
supplied with a well-defined pulp-cavity, oval in cross-section. The outer 
surface of the crown is ornamented by a series of ridges. Two outer ridges 
and an approximately median ridge are much stronger than the others, and 
extend in a less well-defined manner along the outer surface of the root. 
The " median " ridge divides the outer crown surface into two unequal 
areas, of which the smaller is probably the posterior, as in Gamptosaurus. 
The outer ridges do not form the anterior and posterior limits of the 
crown. They start from points approximately midway between the 
"median" ridge and these borders, and pass from the cingulum to 
the limiting edges of the crown, as shown in Fig. 1. In the areas lying 
between the "median" and outer ridges are a number of lesser ridges 
which do not pass on to the surface of the root. The smaller area carries 
Fig. 1. Fig. 2. 
Maxillary Tooth of Kangnasaurus coetzeei. x 2-5. 
Fig. 1. — Outer View. 
Fig. 2. — Inner View. 
7 ridges of various sizes, and the larger 8. The arrangement of these 
subsidiary ridges can best be understood from the figure. The majority of 
them pass on to the "median" ridge or the strong lateral ridges. The 
tooth is longitudinally curved. The inner surface of the crown is gently 
convex, and is supplied with a few slight longitudinal ridges, which cause 
the inner edge of the worn surface to be slightly sinuous. 
While agreeing in the possession of the strong median ridge and lateral 
ridges with the teeth of Camptosaurus, Hypsilophodon, and Mochlodon, 
this tooth shows many differences from those genera. In Mochlodon and 
Camptosaurus the area between the median ridge and the outer ridge is 
U-shaped; and while in Hypsilophodon there is a slight angle at the 
