No. 2z.] THE HARD PARTS OF THE MAMMALTA. 275 
1878. Cope, E. D. American Naturalist, January; The Relation of Animal 
Motion to Animal Evolution; reprint, Origin of the Fittest, 1887, 
P- 350. 
1878. Ryder, J. A. Proceedings Academy Natural Sciences, Philadelphia, 
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. 
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- 
1887. Cope, E. D. American Naturalist, pp. 985, 1060; The Perissodactyla. 
1888. Cope, E. D. Proceedings of the American Association for the Advance- 
ment of Science, p. 254; on the Mechanical Origin of the Sectorial 
Teeth of the Carnivora. 
1888. Cope, E. D. American Naturalist, p. 3; The Mechanical Causes of 
the Origin of the Dentition of the Rodentia. 
1888. Cope, E. D. The Mechanical Origin of the Dentition of the Ambly- 
poda. Proceedings of the American Philosophical Society, p. 80. 
1888. Ryder, J. A. The several functions of the enamel organ in the devel- 
opment of the teeth of mammals, and on the inheritance of mutila- 
tions. American Naturalist, p. 547. 
1889. Cope, E. D. American Naturalist, March; The Artiodactyla. (The 
elbow joint; the zygapophyses.) 
Vi LIST OF COURS THE LEX. 
Fic. 1. Limbs of Phenacodus primevus and Homo sapiens. 
Fic. 2. Posterior limbs of Artiodactyla: A, Merycocherus montanus; B, Bos 
laurus. 
Fic. Tarstus spectrum, posterior limb; from De Blainville. 
Fic. 4. Tarsi of bats; from Allen. 
Fic. 5. Anterior limb of right whale; from Cuvier. 
Fic. 7. Monachus albiventer, fore and hind limbs; original. 
Fic. 8. Pantolambda bathmodon, posterior digit; original. Coryphodon elephan- 
topus, posterior foot; original. Uzntathertum mirabile, posterior foot; from Marsh. 
Fic. 9. Phenacodus primevus, anterior foot; original. 
Fic. 10. Hyracotherium venticolum, anterior foot; original. 
Fic. 11. Protohippus sejunctus, posterior foot; original. 
Fic. 12. Poébrotherium labiatum, fore and hind feet; original. 
Fic. 13. £guus caballus, fore and hind feet; from Cuvier. 
Fic. 14. Artiodactyla, fore feet; from Kowalevsky. 
Fic. 15. Procyon lotor, three views in locomotion, showing gait; from Allen. 
Fic. 16. Ovis (Gazella) dorcas ; from Standard Natural History. 
Fic. 17. Botcherus humerosus, distal extremity of radius and humerus, and fore 
foot; original, 
a 
4 
5 
Fic. 6. Putorius vison, muscles of the posterior leg; original diagram. 
7 
8 
