OF 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. Ina 
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 occidentalis, Leidy, Proc. Acad. Nat. Sci. Phila. 1856, 311, and Trans. Am. Phil. Soe. 1859, 151. 
Ischyrotherium antiquum, Leidy, . ef 2 SY, ” e «150. 
Mylognathus priscus, Leidy, “ is “6812, g © = 4008 
Compsemys victus, Leidy, alle ¢ “ 78, 312, “ of 162. 
Emys obscurus, Leidy, " . “i “ ‘t,: Ob. 
GASTEROPODA. 
CERITHIADA. 
Cerithium (Cerithidea f Nebrascensis, M. & H. June 1860, Pr. Acad. Nat. Sci. Phila. 125. 
MELANIADAR. 
Melania? Warreni, M. & H. May 1857, Pr. ag Nat. Sci. Phila. 137. 
Melaniasubtortuosa,M.&H. “ 2 136. 
Melania Nebrascensis, M. & H. June 1856, Pr. Acad. Nat. Sci. Phila. 124. 
Melania tenuicarinata, M.& H. May 1857, “ 34 187. 
Melania convexa, M. & H. 
Turritella convexra, M. & H. ah ay Py, ee Nat. Sci. Phila. ee 
Melania convexa, M. & H. re 5. 
Melania sublevis, M. & H. = e i AB. 
Melania? Anthonyi,M.& H. “ oi Mi [4 
Melania minitula, M. & H. June 1856, “ S 128, 
VIVIPARID&. 
Vivipara Conradi, Meek & Hayden. 
Paludina Conradi, M. & H. June 1856, Pr. Acad. Nat. Sci. Phila. 122. 
Vivipari Conradi, M. & H. May 1860, e : 185. 
Vivipara Nebrascensis Meek & Hayden. 
Paludina multilineata, M. & H. June 1856, Pr. Acad. Nat. Sci. — 120. (Non P. multilineata, Say, 1829.) 
Vivipara multilineati, M. & H. May 1860, " 185. 
* The Catalogue of Invertebrata here nee 2 extracted from a catalogue of Heirs fossils published by Mr. Meek and myself 
in the Proceedings of the Academy, in Oct. 
