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Transactions of the Royal Society of South Africa. 
median ridge and are continuous down the whole of the crown, thus 
providing a serrated cutting edge with a constant number of serrations 
throughout the hfe of the tooth. Kangnasaurus appears to occupy an 
intermediate place between Mochlodon and Camptosaurus. Some of the 
ridges continue to the base of the crown, while others die out by being 
joined to the median ridge. These latter, however, seem longer and 
more prominent than the shorter ridges in Camptosaurus. 
The chief features of the femur are its curvature and the comparative 
smallness of the inner trochanter, which lies wholly on the proximal half 
of the shaft. In the position of the trochanter it agrees with Camptosaurus 
leedsi, Dryosaurits, and Hypsilophoclon, and differs from the other species 
of Camptosaurus. The anterior intercondylar notch is wide and shallow, 
and agrees with that of Camptosaurus and Hypsilophoclon. Nopsca 
considers that the more complex development of the tooth runs hand 
in hand with the diminution in size of the fourth trochanter. Unfortu- 
nately, the femur of Mochlodon is unknown. 
Such facts as are at our disposal point to the conclusion that this form 
is a later type than Camptosaurus, but without further evidence specula- 
tion as to the exact age of the remains would be very premature. It 
must be remembered that Gilmore has described a new form closely allied 
to Camptosaurus from the Lance Formation of Wyoming — a deposit 
placed by some workers in the Upper Cretaceous and by others in the 
Lower Tertiary — and that Dinosaurs are also said to have been obtained 
in situ in the Eocene beds of Patagonia and of Colorado.* On the other 
hand, an Ornithopodous Dinosaur allied to Laosaurus and Hypsilophodon, 
and whose femur is about three-quarters the size of the one here described, 
has been found in the beds of Tendaguru, in German East Africa, which 
are undoubtedly of Cretaceous age. 
* Matthew (Bull. Geol. Soc, America, 25, p. 401) points out that there is no a priori 
improbability in the survival of Dinosaurs in South America into Tertiary times, and after 
their extinction in the Northern Hemisphere, but adds that the evidence that they did so 
seems open to very serious question. 
