The fossil reptiles of New Jersey - 1867
An Account of Some Kjoekkenmoeddings, or Shell-Heaps, in Maine and Massachusetts - 1868
The fossil reptiles of New Jersey - 1869
Reptilia of the Triassic formation of the United States - 1870
Discovery of a huge whale in North Carolina - 1870
On the genetic relations of the cetaceans and the methods involved in discovery - 1873
The sea serpents of the Cretaceous Period - 1877
The saurians of the Dakota Epoch - 1877
A new opisthocoelous dinosaur - 1878
The affinities of the Dinosauria - 1878
The cave bear of California - 1879
New Jurassic Dinosauria - 1879
A Laramie saurian in the Eocene - 1881
New genus of Perissodactyla diplarthra - 1881
Mammalia of the lower Eocene beds - 1881
A new Clidastes from New Jersey - 1881
Two new genera of Mammalia from the Wasatch Eocene - 1882
The structure and appearance of a Laramie dinosaurian - 1883
The Batrachia of the Permian Period of North America - 1884
The power of motion in crinoid stems - 1884
The White River beds of Swift Current River, Northwest Territory - 1885
The oldest Tertiary Mammalia - 1885
The mammalian genus Hemiganus - 1885
The genera of the Dinocerata - 1885
Marsupials from the lower Eocene of New Mexico - 1885
The relations of the Puerco and Laramie deposits - 1885
The sternum of the Dinosauria - 1886
Crinoid beds at Crawfordsville, Indiana - 1887
The dinosaurian genus <i>Coelurus</i> - 1887
Notes on the Rockford Shales - 1888
The Edentata of North America - 1889
The naticoid genus, Strophostylus - 1890
Genesis of the Actinocrinidae - 1890
The Echinodermata of the Carboniferous - 1890
Fossil birds from the Equus Beds of Oregon - 1891
On two new perissodactyles from the White River Neocene of Nebraska - 1891
On a new genus of Mammalia from the Laramie Formation - 1892
On Symmorium, and the position of cladodont sharks - 1893
Notes on the classification of the Cryptodira - 1893
A new Plistocene sabre-tooth - 1893
The phylogeny of the whalebone whales - 1895
Notice of a new camel from the Lower Miocene of Nebraska - 1909