APPENDIX 



Art. XXXI. — Discovery of Cretaceous Mammalia. Part 

 III; by O. C. Marsh. (With Plates Y-XI.) 



Ik this Journal for July, 1889, the writer announced the 

 discovery of various remains of Cretaceous mammals in the 

 Laramie of Wyoming, and gave figures and brief descriptions 

 of some of the best preserved specimens. In the following 

 number, the subject was continued, and additional remains 

 were described.* Since then, systematic explorations have 

 been made in the same and other localities, and, at the present 

 time, more than a thousand specimens are available for 

 examination. These fossils are all fragmentary, but they 

 throw considerable light on this peculiar fauna, showing it to 

 be as yet limited, but more varied than the first discoveries 

 indicated. 



All the mammals found are small in size. They are mainly 

 Mesozoic in type, and more nearly related to the Jurassic 

 forms below than to those in the Tertiary above. Carnivores, 

 Rodents, and Ungulates, still appear to be wanting in this 

 horizon, and true Insectivores have not yet been identified 

 with certainty. The Allotheria are most numerous, and the 

 evidence that this group is closely related to the modern 

 Monotremes, if not their ancestors, has been strengthened by 

 the discoveries recently made. The CimolestidcB, a family 

 allied to the existing Opossums, are especially abundant, and 

 other Marsupials appear to be represented among the remains 

 secured. 



In this paper, the third of the series, additional specimens 

 from the same horizon are briefly described, and these and 

 many others are carefully figured. In a later communication, 

 the relations of these forms to each other and to allied Mesozoic 

 and Tertiary mammals will be considered, and the whole 

 subject fully discussed. 



* This Journal, III, vol. xxxviii, pp. 81-92, plates ii-v, July, 18S9: and pp 

 177-180, plates vii-viii, August, 1889. 



