Prof. H. G. Seeley. On the Classification [Nov. 24, 



see no reason to doubt that these two types of iliac bones are available 

 for purposes of classification. 



The pubes also present two types. First there are genera in which 

 the bones are directed anteriorly and meet by a median symphysis, 

 and have no posterior extension except for the proximal symphysis 

 with the ischium. This type is represented by Cetiosaurus, 

 Ornithopsis, Megalosaurus, and many genera figured by Professor 

 Marsh. The second form of pubis has one limb which is directed 

 backward parallel to the ischium, and another limb directed forward. 

 It is typically seen in Omosaurus and in Iguanodon. There are many 

 variations in stoutness and details of form of the bones, but so 

 far as I am aware these two plans comprise all the Dinosaurian 

 genera. 



So far as can be ascertained by comparison of figures and specimens, 



Stegosauria. Ornitliopoda. 



Allosaurus. Morosaurus. 



