Counterbalanced Cranium (1861)

F. Rhymer Jones. The General Structure of the Animal Kingdom. 3rd. ed.  (London: John Van Voorst, 1861).

Alligator Limbs A & B (1897)

Syndey H. Reynolds. The Vertabrate Skeleton. (Cambridge: The University Press, 1897).

Pachydermata Variation (1840)

William Charles L. Martin. A Natural History of Quadrupeds, and other Mammiferous Animals. Illustrations by William Harvey. (London: Whitehead and Company, 1840).

Manikin for Tiger (1900)

William Temple Hornaday, William Jacob Holland. Taxidermy and Zoological Collecting, 7th ed. (New York: Charles Scribner's Sons, 1900.)

Left Half of the Skeleton (1897)

Sydney H. Reynolds. The Vertebrate Skeleton. (Cambridge: University Press, 1897).

Neither Hands Nor Talons (1854)

Richard Owen, The Principal Forms of the Skeleton and the Teeth (Philadelphia: Blanchard and Lea, 1854), 74.

Showing Method of Binding (1884)

Montagu Browne. Practical Taxidermy: A Manual of Instruction to the Amateur in Collecting, Preserving, and Setting Up Natural History Specimens of All Kinds : to which is Added a Chapter Upon the Pictorial Arrangement of Museums. (London: L. Upcott Gill, 1884).

Peculiar Modification (1891)

George Ricks. Natural History Object Lessons: A Manual for Teachers. (Boston: D.C. Heath & Company, 1891.

Uselessness of Small Variations (1900)

C.F. Marshall, ed. Lectures on the Darwinian Theory Delivered by the Late Arthur Milnes Marshall. (New York: The MacMillan Company, 1900.)

Salmon Skull, Lateral View (1897)

Sydney H. Reynolds. The Vertebrate Skeleton. (Cambridge: University Press, 1897).