On some Dinosmir Bemains from Biishmanland. 
263 
The following table gives some of the chief measurements : — 
Greatest length of femur (2731) 396 mm. 
Greatest diameter of proximal end of femur {2131d) ... 100 
Greatest diameter of distal end of femur 107 
Greatest diameter of proximal end of tibia (2731c) 106 
Greatest diameter of distal end of tibia (273 Ij) 65 
Greatest length of caudal vertebra 17 
Greatest width of caudal vertebra 30 
Greatest height of caudal vertebra 50 ,, 
Affinities. — The genera with which this form shows the most points of 
agreement are Camptosaurus and its allies of the American forms, and 
Hypsilophodon and Mochlodon of the European forms. Of these 
Camptosaurus is from the Upper Jurassic, Hypsilophodon from the 
Wealden, and Mochlodon from the Upper Cretaceous. 
In the description given of the tooth, the chief peculiarities have 
already been described. Nopsca, in his discussion of Mochlodon, con- 
siders that a portion of the Ornithopoda, including the genera Hypsilo- 
phodon, Mochlodon, and Camptosaurus, have carried out a specialization 
of the teeth through the introduction of secondary ridges and simple 
and double notches. Comparing the teeth of MocJdodon and of Campto- 
saurus it seems that the former may be considered to be the more 
highly specialized in that all the secondary ridges are parallel to the 
