101 



ploring expedition under the command of Lieut. Q. K.Warren, Topo- 

 graphical Engineers, U. S. A., together with some remarks on the 

 geology of the Black Hills and portions of the surrounding country. — 

 (Proc. Acad. Nat. Sci. Pa., March, 1858, p. 19.) 



By F. V. Hayden : 



7. Notes explanatory of a map and section, illustrating the geo- 

 logical structure of the country bordering on the Missouri river, from 

 the mouth of the Platte to Fort Benton in latitude 41° 30' N., longi- 

 tude 110° 30' W.— (Proc. Acad. Nat. Sci., Pa., May, 1857, p. 10.) 



8. Notes on the geology of the Mauvaises Terres of White river. — 

 (Proc. Acad. Nat. Sci., Pa., June, 1857, p. 8.) 



9. Explanations of a second edition of a geological map of Nebraska 

 and Kansas, based upon information obtained during an expedition 

 to the Black Hills, under the command of Lieutenant Gr. K. Warren, 

 topographical engineers. United States army. — (Proc. Acad. Nat. Sci., 

 Pa., June, 1868, p. 22.) 



Dr. Leidy's descriptions of the new vertehrata, collected from time 

 to time, are distributed through various numbers of the proceedings 

 of the Philadelphia Academy for the years 1856, 1857 and 1858. 

 The principal paper was published in March last, and bears the fol- 

 lowing title : "Notice of remains of extinct vertehrata from the valley 

 of the Niobrara river collected by Dr. F. V. Hayden, geologist to the 

 expedition, under the command of Lieutenant G. K. Warren, topo- 

 graphical engineers. United States army, by Joseph Leidy, M. D." 

 The details of the geology of the regions explored will be reserved 

 for your final report. 



The following is the number of species comprised in the collection 

 from each department of natural history as far as they have been 

 studied, up to this time. The catalogue includes none of the insects 

 of which there are many species, nor the cryptogamic plants which 

 have not yet been identified. 



Number of species of fossil vertehrata • 77 



Number of species of fossil mollusca 251 



Number of fossil plants 70 



Number of minerals and geological specimens 423 



Number of species of recent mammals 47 



Number of species of birds 186 



Number of species of recent mollusca 65 



Number of species of fishes 24 



Number of species of reptiles 28 



Number of species of recent plants 1,500 



Of the fossil mollusca named in this catalogue 186 species were new 

 to science, upwards of 50 of the vertehrata and all the fossil plants 

 are supposed to be new. A number of rare or entirely new species 

 were discovered in all departments of natural history. 'The specimens 

 are now deposited in the museum of the Smithsonian Institution, and 

 in behalf of the expedition I would return my grateful thanks to the 



