| A revision of the family of fossil turtles called Toxochelyidae; with descriptions of two new species of Toxochelys and a new species of Porthochelys |
Hay, O.P. |
American Museum of Natural History, Bulletin vol. 21, pp. 177-185 |
1905 |
N/A
|
| American Permian vertebrates |
Hay, O.P. |
American Naturalist vol. 46, pp. 561-565 |
1912 |
N/A
|
| An important but not well known locality furnishing Cretaceous fishes, (abstr.) |
Hay, O.P. |
Geological Society of America, GSA Bulletin vol. 14, p. 542 |
1904 |
N/A
|
| Bibliography and catalogue of the fossil Vertebrata of North America |
Hay, O.P. |
U.S. Geological Survey, Bulletin no. 179, 868 pages |
1902 |
N/A
|
| Description of a new species of mastodon, Gomphotherium elegans, from the Pleistocene of Kansas |
Hay, O.P. |
U.S. National Museum, Proceedings vol. 53, pp. 219-221 |
1917 |
N/A
|
| Description of two species of fossil turtles, Toxochelys stenopora and Chisternon? interpositum, the latter hitherto unknown |
Hay, O.P. |
U.S. National Museum, Proceedings vol. 36, pp. 191-196 |
1909 |
N/A
|
| Further considerations of the skull of Chelys and of the constitution of the armor of turtles in general |
Hay, O.P. |
U.S. National Museum, Proceedings vol. 73, no. 3, pp. 1-12 |
1928 |
N/A
|
| Notes on some fossil horses, with descriptions of four new species |
Hay, O.P. |
U.S. National Museum, Proceedings vol. 44, pp. 569-594 |
1913 |
N/A
|
| Notes on species of Ichthyodectes, including the new species I. cruentus, and on the related and herein established genus Gillicus |
Hay, O.P. |
American Journal of Science series 4, vol. 6, pp. 225-232 |
1898 |
N/A
|
| Observations on the genus of fossil fishes called by Prof. Cope Portheus, by Dr. Leidy Xiphactinus |
Hay, O.P. |
Zoological Bulletin vol. 2, pp. 25-54 |
1898 |
N/A
|
| On Protostega, the systematic position of Dermochelys, and the morphogeny of the chelonian carapace and plastron |
Hay, O.P. |
American Naturalist vol. 32, pp. 929-948 |
1898 |
N/A
|
| On a collection of fossil vertebrates made by Dr. F.W. Cragin in the Equus beds of Kansas |
Hay, O.P. |
Kansas University Science Bulletin vol. 10, no. 4, pp. 39-51 |
1917 |
N/A
|
| On certain portions of the skeleton of Protostega gigas |
Hay, O.P. |
Field Columbian Museum, Publications, Zoological Series vol. 1, pp. 57-62 |
1895 |
N/A
|
| On one little known and one hitherto unknown species of Saurocephalus |
Hay, O.P. |
Annals and Magazine of Natural History series 7, vol. 3, pp. 480-487 |
1899 |
N/A
|
| On one little known and one hitherto unknown species of Saurocephalus |
Hay, O.P. |
American Journal of Science series 4, vol. 7, pp. 299-304 |
1899 |
N/A
|
| On restorations of skeletons of fossil vertebrates |
Hay, O.P. |
Science new series, vol. 30, no. 759, pp. 93-95 |
1909 |
N/A
|
| On the group of fossil turtles know as Amphichelydia; with remarks on the origin and relationships of the suborders, superfamilies, and families of testudines |
Hay, O.P. |
American Museum of Natural History, Bulletin vol. 21, pp. 137-175 |
1905 |
N/A
|
| On the phylogeny of the shell of the Testudinata and the relationships of Dermochelys |
Hay, O.P. |
Journal of Morphology vol. 36, pp. 421-445 |
1922 |
N/A
|
| On the skeleton of Toxochelys latiremis |
Hay, O.P. |
Field Columbian Museum, Publications, Zoological Series vol. 1, pp. 101-106 |
1896 |
N/A
|
| Second bibliography and catalogue of the fossil Vertebrata of North America |
Hay, O.P. |
Carnegie Institution of Washington, Publication no. 390, vol. 2, 1074 pages |
1930 |
N/A
|
| Second bibliography and catalogue of the fossil Vertebrata of North America |
Hay, O.P. |
Carnegie Institution of Washington, Publication no. 390, vol. 1, 916 pages |
1929 |
N/A
|
| Snout fishes of Kansas, (abstr.) |
Hay, O.P. |
Science new series, vol. 15, no. 377, p. 470 |
1902 |
N/A
|
| Snout fishes of Kansas, (abstr.) |
Hay, O.P. |
American Geologist vol. 29, pp. 192-193 |
1902 |
N/A
|
| Ten years progress in vertebrate paleontology; Chelonia |
Hay, O.P. |
Geological Society of America, GSA Bulletin vol. 23, pp. 212-220 |
1912 |
N/A
|
| The Pleistocene Age and its Vertebrata |
Hay, O.P. |
Indiana Department of Geology and Natural Resources, Annual Report no. 36, pp. 539-784 |
1912 |
N/A
|
| The chronological distribution of the elasmobranchs |
Hay, O.P. |
American Philosophical Society, Transactions new series, vol. 20, pp. 63-75 |
1901 |
N/A
|
| The fossil turtles of North America |
Hay, O.P. |
Carnegie Institution of Washington, Publication no. 75, 568 pages |
1908 |
N/A
|