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Proc. Zoological Society. London, 1875. p. 159. 



18. Forsyth Major, C. J. Beitrage zur Geschichte der Fossilen Pferde. 



Abhandlungen der Schweizerischen Palceontologischen Cesellschaft, 

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19. Furbringer, M. Untersuchungen zur Morphologie und Systematik der 



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20. Galton, F. Natural Inheritance. London, 1889. 



21. Geddes and Thompson. The Evolution of Sex. New York, 1890. 



22. Haeckel, E. Report on the Siphonophoras. Challenger Reports, 



Zoology, Vol. XXVIII. 



23. Hyatt, A. Genesis of the Arietidae. Memoirs Museum of Comparative 



Zoology, Vol. XVI., No. 3. 



24. Jackson, R. T. Phylogeny of the Pelecypoda. Mem. Boston Society 



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25. Kowalevsky, W. Sur rAnchitherium aurelianense. Mem.deVAcad. 



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26. Id. — Monographie der Gattung Anthracotherium. Palcvonlographica, 



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27. Krueg, J. Ueber die Furchung der Grosshirnrinde der Ungulaten. 



Zeitschrift filr wissenschaftliche Zoologie, Bd. XXXI., p. 297. 



28. Lane, W. Arbuthnot. Manner in which Pressure Changes in the 



Skeleton, etc. Joum. of Anatomy and Physiology, Vol. XXL, 

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29. Id. — Can the Existence of a Tendency to change in the Form of the 



Skeleton of the Parent result in the Actuality of that Change in the 

 Offspring? Ibid., Vol. XXIL, p. 215. 



30. Id. — The Anatomy and Physiology of the Shoemaker. Ibid., p. 593. 



31. Lankester, E. Ray. Panmixia. Nature, Vol. XLL, p. 558. 



32. Leidy, J. Proceedings Academy Natural Sciences of Philadelphia, 1850, 



p. 122. 



33. Id. — The Extinct Mammalian Fauna of Dakota and Nebraska. Phila- 



delphia, 1869. 



34. Marsh, O. C. Notice of New Tertiary Mammals. American Journal 



Science and Arts, 3d Ser., Vol. IX., p. 239. 



35. Id. — Introduction and Succession of Vertebrate Life in America. Ibid., 



P- 337- 



36. Marey, E. J. Animal Mechanism. New York, 1874. 



27- Milne-Edwards, A. Recherches sur la Famille des Chevrotains. An- 

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38. Mivart, St. G. On Lepilemur and Cheirogaleus. Proceedings Zoologi- 



cal Society of London, 1873, p. 484. 



39. Morgan, C. Lloyd. Animal Life and Intelligence. Boston, 1891. 



40. Neumayr, M. Die Stamme des Thierreiches. Vienna, 1889. 



41. Osborn, H. F. The Mammalia of the Uinta Formation. Transactions 



American Philosophical Society , N. S., Vol. XVI., p. 506. 



42. Id. — Fossil Mammalia from the White River and Loup Fork. Bulletin 



Museum of Comparative Zoology, Vol. XVI., No. 5. 



