APPENDIX 



Aet. XXXIV. — Comparison of the Principal Forms of 

 the Dinosauria of Europe and America'* by Professor 

 0. C. Maesh. 



The remains of Dinosaurian reptiles are very abundant in 

 the Rocky Mountain region, especially in deposits of Jurassic 

 age, and during the past ten years, the author has made exten- 

 sive collections of these fossils, as a basis for investigating the 

 entire group. The results of this work will be included in 

 several volumes, two of which are now well advanced towards 

 completion, and will soon be published by the United States 

 Geological Survey. 



In the study of these reptiles, it was necessary to examine 

 the European forms, and the author has now seen nearly every 

 known specimen of importance. The object of the present 

 paper is to give, in few words, some of the more obvious 

 results of a comparison between these forms and those of 

 America which he has investigated. 



With this purpose in view, it will not be necessary to dis- 

 cuss here the classification of the Dinosauria, their affinities, or 

 their origin. These topics will be treated fully in the volumes 

 in preparation. For the sake of convenience, however, the 

 ordinal names proposed by the author, and now in general 

 use, will be employed. 



* Abstract of a paper read before Section C, of the British Association for the 

 Advancement of Science, at the Bath Meeting, Sept. 8th, 1888. 



