THE OPINIONS OF NEO-LAMARCKIANS. 529 



1872. Cope, E. D. Perm Monthly Magazine, May-July. On Evo- 

 lution and Its Consequences ; reprinted in Origin of the 

 Fittest, 1887, p. 30. 



1877. Ryder, J. A. American Naturalist, p. 607. On the Laws 

 of Digital Reduction. 



1877. Ryder, J. A. Proceedings of the Academy of Natural Sci- 



ences of Philadelphia, p. 314. On the Significance of the 

 Diameter of the Incisors of the Rodents. 



1878. Cope, E. D. American Naturalist, January. The Relation 



of Animal Motion to Animal Evolution ; reprinted in 

 Origin of the Fittest, 1887, p. 350. 

 1878 Ryder, J. A. Proceedings Academy Natural Sciences, Phila- 

 delphia, p. 45. On the Mechanical Genesis of Tooth- 

 Forms. 



1879. Cope, E. D. American Naturalist, March. On the Origin 



of the Specialized Teeth of the Carnivora ; Origin of the 

 Fittest, 1887, p. 363. 



1880. Hyatt, A. Memoirs Boston Society Natural History, Fiftieth 



Anniversary. Genesis of the Tertiary Species of Planor- 

 bis at Steinheim. 



1881. Cope, E. D. American Naturalist, April and June. On the 



Origin of the Foot-Structures of the Ungulates. On the 

 Effect of Impacts and Strains on the Feet of Mammalia ; 

 Origin of the Fittest, 1887, pp. 368, 373. 



1883. Ryder, J. A. Popular Science Monthly, XIII., pp. 139- 

 145, 4 figs. The Gigantic Extinct Armadillos and Their 

 Peculiarities. [Discusses the mechanical genesis, degen- 

 eration, and coalescence of vertebral centra.] 



1885. Ryder, J. A. American Naturalist, pp. 411-415. On the 

 Position of the Yolk-Blastopore as Determined by the Size 

 of the Vitellus. 



1885. Ryder, J. A. American Naturalist, pp. 815-819 and 903- 

 907. On the Availability of Embryological Characters in 

 the Classification of the Chordata. 



1885. Ryder, J. A. American Naturalist, pp. 1013-1016. On the 

 Genesis of the Extra Terminal Phalanges in the Cetacea. 



1885. Ryder, J. A. American Naturalist, pp. 90-97. An Outline 



of a Theory of the Development of the Unpaired Fins of 

 Fishes. 



1886. Ryder, J. A. American Naturalist, pp. 179-185. The Origin 



of the Amnion. 



