202 



TITANOTHERES OP ANCIENT "WTOMING, DAKOTA, AND NEBRASKA 



Chronologic list of the genera and species of Oligocene titanotheres — Continued 



[Generic names accepted in ttiis work as valid are printed in small capitals; abandoned names are inclosed in brackets.] 



Present determination 



27 

 XV 



28 

 29 

 XVI 

 30 

 XVII 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 42 

 43 

 44 

 45 

 46 

 47 

 48 

 49 



1887 

 1S89 

 1889 

 1889 

 1890 

 1890 

 1890 

 1890 

 1891 

 1891 

 1891 

 1891 

 1892 

 1896 

 1902 

 1902 

 1902 

 1902 

 1905 

 1908 

 1908 

 1908 

 1908 

 1913 

 1916 

 1916 



serotinus. 



selwynianus . 

 syceras 



amplus. 



AUops 



[Haplacodon] " 



[Menodus] 



[Menodus] 



DiPLOCLONUS 



Diploclonus 



Teleodus 



Teleodus 



Allops 



Brontops 



[Titanops] 



[Menodus] 



[Menodus(?)] 



[Titanotherium] 



[ Megacerops] 



[ Megacerops] 



[Megacerops] 



Brontotherium 



[Megacerops] 



Brontotherium 



[Symborodon] 



[ Megacerops] j primitivus — 



Megacerops assiniboiensis 



[Titanotheriu m] | [bohemicum] _ 



Allops ' walcotti 



Megacerops j riggsi 



Marsh. 

 Gope_- 

 do_ 



avus 



crassicornis 



[validus] 



medius 



[peltoceras] 



rumelicus 



ramosum 



braehycephalus - 



bicornutus 



marshi 



leidyi 



tyleri 



hatcheri 



copei 



do_ 



Marsh. 

 do- 



.do. 

 .do. 

 -do. 



do_ 



do_ 



Cope.. 



Toula.. 



Osborn. 

 do. 



.do. 

 .do. 

 .do. 



LuU... 

 Osborn. 

 do- 



Lambe.- 

 do.. 



Kiernik. 



Osborn.. 

 do_. 



Allops serotinus Marsh. 

 Allops sp. 



Diploclonus selwynianus (Cope). 

 ? Megacerops syceras (Cope). 

 Diploclonus Marsh. 

 Diploclonus amplus Marsh. 

 Teleodus Marsh. 

 Teleodus avus Marsh. 

 Allops crassicornis Marsh. 

 Brontops dispar Marsh. 

 Brontotherium medium (Marsh). 

 ? Brontotherium curtum (Marsh). 

 ? Brontotherium rumelicum (Toula). 

 Brontotherium ramosum (Osborn). 

 Brontops braehycephalus (Osborn) . 

 ?Diploclonus bicornutus (Osborn). 

 Allops marshi (Osborn). 

 Brontotherium leidyi Osborn. 

 ? Diploclonus tyleri (Lull). 

 Brontotherium hatcheri Osborn. 

 Megacerops copei (Osborn). 

 Teleodus primitivus (Lambe). 

 Megacerops assiniboiensis Lambe. 

 Menodus giganteus Pomel. 

 AUops walcotti Osborn. 

 Megacerops riggsi Osborn. 



« Genotype Menodus angastigenis, upper teeth only. See No. 18, above. 



PROUT'S DESCRIPTIONS OF A FRAGMENTARY lOWER JAW, 

 THE FIRST TITANOTHERE MADE KNOWN TO SCIENCE 



"Gigantic Palaeotherium," Prout, 1846 



Original reference. — Am. Jour. Sci., 2d ser., vol. 2, 

 pp. 288-289, 1 fig., 1846 (Prout, 1846.1). 



Subsequent references. — Leidy, Description of the 

 remains of extinct IVIammalia and Clielonia from 

 Nebraska Territory, in Owen, Report of a geological 

 survey of Wisconsin, Iowa, and JMinnesota, p. 551, 

 1852 [Tab. 9, figs. 3, 3a, is not Prout's specimen] 

 (Leidy, 1852.1); The ancient fauna of Nebraska, pp. 

 72, 114, pi. 16, fig. 1, 1853 (Leidy, 1854.1). 



Original description. — Dana and Silliman write: 



Gigantic Palaeotherium. — We have recently received infor- 

 mation from Mr. H. A. Prout, of his discovery of the remains 

 of a Palaeotherium in the Tertiary near St. Louis, and we are 

 also indebted to him for a cast of the jaw, a view of the pos- 

 terior tooth of which is represented below. Mr. Prout is pre- 

 paring a memoir on the subject; and in the meantime we 

 state the following facts from his letter. 



This fossil was found in the great northwestern Tertiary 

 belt, which is deflected from the north by the Black Hills and 

 which crosses the Missouri River at about latitude 43°. It 

 was accompanied by several Baculites compressus, an Inocera- 

 mus concentricus, a vertebra of a large fish, and some crystallized 

 gypsum. [As noted later by Prout these were from the Creta- 

 ceous and from another locality.] The entire jawbone, judg- 

 ing from the decrease in size of the teeth, must have been at 

 least 30 inches long, which far exceeds in size the Palaeotherium 

 magnum. The face of the posterior tooth is 4^ inches in 



length; and from the posterior side of the last tooth to the 

 anterior side of the antepenultimate molar of the same side 

 the distance in the specimen is 11 inches. [See fig. 157.] This 

 is the aggregate length, in the line of the jaw, of but three out 

 of seven teeth; and with the most liberal allowance for decrease 

 of size in the other four the whole of the seven could not have 

 measured less than 16 or 18 inches, which is about one-half 

 larger than in the P. magnum. 



Remarlcs. — This specimen was "the first of the 

 many mammalian remains which have been brought 

 to the notice of the scientific world from the vast 

 Eocene cemetery of Nebraska" (Leidy, 1852.1, p. 551). 

 It was the subject of Prout's second article cited below 

 and was the type of Menodus giganteus Pomel and one 

 of the cotypes of Palaeotherium? proutii Owen, Nor- 

 wood, and Evans (1850.1) and of Titanotherium, 

 proutii. 



" Fossil maxillary bone of a Palaeotherium," Prout, 1847 



Original reference. — Am. Jour. Sci., 2d ser., vol. 3, 

 pp. 249, 250, 1 fig., 1847 (Prout, 1847.1). 



Subsequent references. — (See p. 204.) 



Prout's description. — The following notice, written 

 by Dr. Prout himself, is a full description of the same 

 lower jawbone mentioned in his letter of the preceding 

 year: 



The palaeotherial bone here described was sent to me some 

 time ago by a friend residing at one of the trading posts of the 

 St. Louis Fur Co., on the Missouri River. From information 

 since obtained from him, I learn that it was discovered in the 



