10 



Journal . . . S. Arts and Inst, in Union. London, VJ. 280, 284. — 



From the Society. 

 Proceedings A. N. S. Philada. 1859, i. ii. iii. — From the Acad. 

 Amer. Jour. Sci. and Art. New Haven, March, 1859. — From the Ed, 



Dr. Leidy presented the following papers, intended for the 

 Transactions, and remarked that they gave an account of the 

 geology, and of the remains of some extinct vertebrata of a 

 small portion of country near the head-waters of the Missouri, 

 in the Territory of Nebraska. 



This great territory, embracing upwards of 130,000 square miles, 

 is composed of Ibrmations of the Cretaceous and later Tertiary 

 periods, with here ai]d there a protrusion of Metamorphic rocks. 

 Watered by the many western tributaries of the Missouri, almost all 

 of these, so far as they have been explored, have yielded large num- 

 bers of species of extinct organic forms, vegetable and anirrial. 



From the Mauvaises Terres of White River, a miocene tertiary 

 freshwater formation, apparently a lacustrine deposit, an immense 

 quantity of fossil bones of extinct mammals and turtles have been col- 

 lected. In collections made by gentlemen of the Fur Company, by 

 Jesuit Missionaries, by Dr. Hayden ; and in others obtained under the 

 auspices of the government, the Smithsonian Institution, and Professor 

 James Hall, altogether forming from 6000 to 8000 lbs. of fossils, sub- 

 mitted to Dr. Leidy's inspection — he had detected the remains of 30 

 extinct mammals and 1 turtle. Of these there are 10 species of the 

 extinct genera of rw/ninawYs, Oreodon, Agriochoerus, Poebro-therium, 

 Dorca-therium. Leplauchenia and Protomeryx; 8 species of /?rtc/j2/- 

 derms of the genera Hyopotamus, Elotherium, Titanotherium, Pala?o- 

 choerus, Leptochcerus, Flyracodon and Rhinoceros; of solipcds, a 

 species of Anchitherium ; of rodents, 4 species of the genera Chali- 

 comys, Ischyromys, Palseolagus and Eumys; oC carnivora, 1 species 

 of the genera Hysenodon, Amphicyon, Drepanodon* and Dcinictis; 

 and the turtle forms the type of the extinct genus, Stylemys. 



■'^The name Drepanodon, was applied by Nesti, as early as 182G, to the 

 sabretoothed tiger, for which, subsequently, a number of other names have 

 been employed — that of Machairodus of Kamp, being the most familiar. The 

 author of the above remarks applied the name Drepanodon, in 18oG, to an 

 extinct reptile or fish, a tooth of which was discovered by Prof. E. Emmons, 

 at Cape Fear, North Carolina. (See Proceedings of Acad. Nat. Sci. Vol. 

 VIII. 255.) The author would now substitute the name Lesticodus impar, 

 Leidy, for the animal. 



