OP THE UPPER MISSOURI. 
101 
lithological characters of the strata, and will enable the geological reader to compare them 
with those of other freshwater deposits in that region. I regret that I cannot yet give a 
complete general section of all the beds in the lignite basin, but, as I hope soon to continue 
my explorations in that interesting country, this desire may yet be accomplished. In a 
subsequent portion of this report I have reviewed in some general remarks the principal 
points of interest now known in connection with this deposit. 
The following catalogue comprises all the fossils yet known and examined from this 
basin. The vertebrata and mollusca thus enumerated show quite distinctly that they 
represent but fragments of a large and interesting fauna, the complete discovery of which 
still remains to reward the future explorer. The fossil plants have not yet been described, 
but the collection already secured contains about fifty species, all of which are supposed to 
be new to science. These plants cannot represent more than a small portion of the flora 
of this period, and future examinations must greatly multiply the number of species. 
TERTIARY SPECIES.* 
VERTEBRATA. 
Thespesius occidentals, Leidy, Proc. Acad. Nat. Sci. Phila. 1856, 311, and Trans. Am. Phil. Soc. 1859, 151. 
Ischyrotherium antiquum, Leidy, “ 
U 
“ 89, 
U 
“ “ 150. 
Mylognathus priscus, Leidy, “ 
u 
“ 312, 
U 
“ “ 153. 
Compsemys victus, Leidy, “ 
u 
“ 73, 312, 
U 
« « 152. 
Emys obscurus, Leidy, “ 
u 
U U 
U 
“ “ 153. 
GASTEROPODA. 
CEPJTHIADT. 
Cerithium (Ceritliidea?) Nebrascensis, M. & H. June 1860, Pr. Acad. Nat. Sci. Phila. 125. 
MELANIAPLE. 
Melania? Warreni, M. & IT. May 1857, Pr. Acad. Nat. Sci. Phila. 137. 
Melania sub tor tuosa, M. & H. “ “ “ 136. 
Melania Nebrascensis, M. & H. June 1856, Pr. Acad. Nat. Sci. Phila. 124. 
Melania t e n u i c a r i n a t a, M. & IT. May 1857, “ “ 137. 
Melania convexa, M. & PI. 
Turritella convexa , M. & PI. March 1856, Pr. Acad. Nat. Sci. Phila. 71. 
Melania convexa, M. & H. “ “ “ 125. 
Melania sublevis, M. & IP. “ “ “ 136. 
Melania? Anthonyi, M. & H. “ “ “ 124. 
Melania mini tula, M. & II. June 1856, “ “ 123. 
VPVTPARIDiE. 
Vivipara C o n r a d i, Meek & Hayden. 
Paludina Conradi, M. & H. June 1856, Pr. Acad. Nat. Sci. Phila. 122. 
Vivipari Conradi, M. & PI. May 1860, “ “ 185. 
Vivipara Nebrascensis, Meek & Hayden. 
Paludina midtilineata, M. & IT. June 1856, Pr. Acad. Nat. Sci. Phila. 120. (Non P. multilineata, Say, 1829.) 
Vivipara midtilineati, M. & II. May 1860, “ “ 185. 
* Tlio Catalogue of Invertebrata here given, is extracted from a catalogue of Nebraska fossils published by Mr. Meek and myself 
in the Proceedings of the Academy, in Oct. 18C0. 
