Trigonias Osborni, Lucas. Unter-Oligocän von Dakota. 



Lucas, Proc. U. St. Nat. Mus. XXIII. pg. 221. 

 Leptaceratherium trigoiiodiim^ 0. ii. W. Oligocän von Dakota. 

 Osborn u. Wortman, Bull. Am. Mus. N. H. VI. 1894. 



pg. 201. PL II A. 

 Osborn, Mem. Am. Mus. N. H. New-York. 1898. I. pg. 132, 



PI. XII. XIII, 1. XIV. XIX, 27. 

 S y n. : Acerath. trig., 0. u. W. 

 Aceratlierium occidentale^ Leidy. Oligocän von Nord-Amerika. 

 Leidy, Proc. Ac. N. Sc. Philad. 1850. V. pg. 119. 

 Leidy, Ext. Mamm. F. Dak. Nebr. 1 869. pg. 390. PL XXII. XXIII. 

 Gope, Am. Nat. XXL 1887. pg. 1000. Fig. 14. 

 Gope, Geol. S. Ganada. 1891. pg. 19. 

 Scott u. Osborn, Bull Mus. Gomp. ZooL Harvard. Goll. XX. 



Nr. 3. 1890 pg. 89. Fig. 13. 

 Pohlig, Bull. Soc. Belg. PaL Bruxelles. 1893. VII. pg. 41. 



PL III. 

 Osborn u. Wortman, Periss. White River. — Bull. Am. 



Mus. N. H. New-York. VII. 1895. pg. 371. Fg. 12. 

 Osborn, Ext. Rhinoc. — Mem. Am. Mus. N. H. New-York. 



1898. pg. 150. PL XIIL Fig. 5-7. XVL XIX. 29. 

 Syn.: Gaenopus occ, Gope. 

 Acer, mite, Cope. Oligocän von Nord-Amerika. 



Gope, Rep. Vert. Golorado (Haydens Ann. Rep.) 1874. 



pg. 493. 

 Gope, Am. Nat. XIX. 1885. pg. 163. 

 Gope, Geol. Surv. Ganada. — Gontrib. Ganad. PaL Vol. III. 



Montreal. 1991. pg. 19. PL IV. Fig. 2-4. 

 Osborn u. Wortman, Bull. Am. Mus. 1894. pg. 203. 

 Osborn, Ext. Rhin. 1898. pg. 136. Fig. 36—39. PL XIII, 2. 

 Syn.: Gaenopus mitis, Gope. — A. pumilum, Gope. — Sub- 



hyracodon mite, Brandt. 

 Acer, slmplicidens, Cope. Oligocän von Nord- Amerika. 

 Gope, Am. Nat. XXV. 1891. pag. 48. 

 Osborn, Ext. Rhin. 1898. pag. 145. Fig. 43. 

 Syn.: Gaenopus s., Gope. 

 Acer. Copei, Osb. Oligocän von Nord- Amerika. 



Osborn, Ext Rhin. 1898. pg. 146. PL XIII, Fig. 3. 4. XV. 



XIX, 28. 



