XXIV BIOGRAPHICAL SKETCH OF JOHN BELL HATCHER. 



3. PALEONTOLOGY, COMPARATIVE ANATOMY. 



3. A median-horned rhinoceros from the Loup Fork beds of Nebraska, March, 1894. 



4. On a small collection of vertebrate fossils from the Loup Fork beds of northwestern Nebraska, with note on the geology 

 of the region, March, 1894. 



5. Discovery of Diceratherium, the two-horned rhinoceros, in the White River beds of South Dakota, May, 1894. 



6. On a new species of Diplacodon, with a discussion of the relations of that genus to Telmatotherium, December, 1895. 



7. Discovery in the Oligocene of South Dakota of Eusmilus, a genus of saber-toothed cats new to North America, Decem- 

 ber, 1895. 



10. Recent and fossil tapirs, March, 1896. 

 13. Diceratherium proavitum, November, 1897. 



17. The mysterious mammal of Patagonia, Grypotherium domesticum, by Rudolph Hauthal. Santiago Roth, and Robert 

 Lehmann Nitsche. Review, December 1, 1899. 



21. Vertebral formula of Diplodocus (Marsh), November 30, 1900. 



24. Some new and little known fossil vertebrates, 1901. 



25. On the cranial elements and the deciduous and permanent dentitions of Titanotherium, 1901. 



26. Sabal rigida; a new species of palm from the Laramie, 1901. 



28. Diplodocus Marsh; its osteology, taxonomy, and probable habits, with a restoration of the skeleton, July, 1901. 



29. On the structure of the manus in Brontosaurus, December 27, 1901. 



30. A mounted skeleton of Titanotherium dispar Marsh, 1902. 



31. Structure of the fore limb and manus of Brontosaurus, 1902. 



32. The genera and species of the Trachodontidae (Hadrosauridse, Claosauridre) Marsh, 1902. 



34. Oligocene Canida?, September, 1902. 



35. Discovery of a musk-ox skull (Ovibos cavifrons Leidy) in West Virginia near Steubenville, Ohio, October 31, 1902. 

 38. A new sauropod dinosaur from the Jurassic of Colorado, February 21, 1903. 



41. A new name for the dinosaur Haplocanthus Hatcher June, 1904. 



42. Discovery of remains of Astrodon {Pleurococlus) in the Atlantosaurus beds of Wyoming, June, 1903. 



46. Osteology of Haplocanthosaurus, with description of a new species and remarks on the probable habits of the Sauro- 

 poda and the age and origin of the Atlantosaurus beds, November, 1903. 



47. Additional remarks on Diplodocus, 1903. 



50. Geology and paleontology of the Judith River beds, by T. W. Stanton and J. B. Hatcher, with a chapter on the 

 fossil plants, by F. H. Knowlton. Bull. U. S. Geol. Survey No. 257, 1905. 



51. Two new species of Ceratopsia from the Laramie of Converse County, Wyo., by J. B. Hatcher. [Edited by Richard S. 

 Lull.] 1905. 



52. The Ceratopsia, a monograph, by J. B. Hatcher, based on preliminary studies by Othniel Charles Marsh, edited and 

 completed by Richard S. Lull. [Biographical notice by Henry Fairfield Osborn.] Mon. U. S. Geol. Survey, vol. 49, 1907. 



In the decade between 1894 and 1904, crowded as it was with administration, with organi- 

 zation of western parties, with his actual labors as a collector, and his two journeys to Patagonia, 

 Hatcher contributed to vertebrate paleontology no less than 25 papers, varying in length from 

 a page to his monograph of 392 manuscript pages on the Ceratopsia. Although he had had 

 little early training as a comparative anatomist, he exhibits the same keen powers of observation 

 as in geology and exceptional ability in selecting new and important characters. This last 

 quality is especially manifested in his work on the rhinoceroses and titanotheres. The form 

 described by Cope and Osborn as Aphelops he soon distinguished as Teleoceras by its possession 

 of a terminal horn on the nasals. Similarly he was the first to observe rudimentary horns in 

 Aceratherium tridactylum, and to determine that this animal was the ancestor of Diceratherium, 

 a point which had been overlooked by Osborn. His independence of mind was illustrated in 

 breaking away from the phylogeny and terminology of the Eocene titanotheres as partly 

 established by Earle, Marsh, and Osborn, and founding a new genus DolicJiorhinus, showing 

 that this genus was not directly ancestral to the titanotheres, as Osborn had supposed, but was 

 a collateral form, and that the true ancestry was to be sought rather in another genus, Manteo- 

 ceras, which he also established, acting upon a suggestion of Wortman. 



Very valuable single papers showing his ability as an osteologist are his ' ' Recent and fossil 

 tapirs" (1896), "Cranial elements of Titanotherium" (1901), and "A mounted skeleton of 

 Titanotherium" (1902). Of much value also are his papers "Some new and little known fossil 

 vertebrates," including his description of Trigonias (1901), and his memoir "Oligocene Canidaa" 

 (1902). 



By far his most important paleontological contributions, however, were those which 

 enriched our knowledge of dinosaurs, especially of the group of Sauropoda. He took an active 



y 



