11 



From a later tertiary formation than the one just indicated, and 

 suspected to be of pleiocene age, on the Neobrara river, explored in 

 the recent expedition of Lieut. G. K. Warren to Nebraska, Dr. Hay den, 

 geologist to the expedition, collected a large quantity of fossil bones. 

 These are of especial interest as indicating a fauna more nearly allied 

 to the existing. fauna of Asia and Africa than to our own. In the 

 collection submitted to the examination of Dr. Leidy, he detected the 

 remains of 29 mammals and 1 turtle. Of these there are 10 species 

 of ruminants of the genera Cervus, xMerycodus, Procamelus, Megalo- 

 meryx, Merycochoerus and Merychyus; 3 pachydej'ms of the genera 

 Rhinoceros, Mastodon and Elephas; ofsolipeds, 8 species of the genera 

 Equus, Hipparion, Protohippus, Hypohippus, Parahippus and iMeryc- 

 hippus; of rodents, 2 species of the genera Hystrix and Castor; of 

 carnivora, 6 species of the genera Canis, Felis and Aelurodon; and . 

 the turtle appears to be a species of Stylemys. 



From the green sand formation of the cretaceous period, through 

 which courses the Missouri and its tributaries, the Grand, Moreau 

 and Cheyenne rivers, with a part of White river, the remains of 

 numerous species of mollusks have been obtained. From this forma- 

 tion it was that Maximilian, Prince of Neuwicd, obtained the skull 

 and vertebral column of Mososaurus Missouriensis, described by Dr. 

 Goldfusz, and now preserved in the Museum of Bonn. Teeth of 

 sharks and remains of sphyraenoid fishes have also been discovered 

 in the same formation. 



From the great lignite basin, an estuary formation of the middle 

 tertiary period, covering many thousand square miles at the upper 

 part of the Missouri river. Dr. Hayden obtained remains of numerous 

 species of plants, mollusks and vertebrates. This basin, and the re- 

 mains of the vertebrated animals discovered in it, form part of the 

 material of the papers presented to the Society this evening. 



The bad lands of the Judith river, a tributary to the head waters of 

 the Missouri, with the vertebrate remains discovered by Dr. Hayden, 

 in those lands, form the other part of the subject matter of the papers 

 just mentioned. 



The paper? presented by Dr. Leidy, for the Transactions, 

 were entitled: A Geological Sketch of the Estuary and Fresh- 

 water Deposite of tiie Bad Lands of the Judith, with some re- 

 marks upon the surrounding formations, by F.V. Hayden, JVLD. ; 

 and On extinct Vertebrata from the Judith and Great Lignite 

 Formations of Nebraska, by Joseph Leidy, ALD. Both papers 



