Books in Animal (sorted alphabetically)
- Sketches of the Natural History of Ceylon Sir James Emerson Tennent
- Some Reptiles and Amphibians from Korea J. Knox Jones, Robert G. Webb, and George William Byers
- Speciation and Evolution of the Pygmy Mice, Genus Baiomys Robert L. Packard
- Speciation of the Wandering Shrew James S. Findley
- Squirrels and other animals George Waring
- Story of an Ostrich: An Allegory and Humorous Satire in Rhyme. I. J. Potter
- Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11] E. Raymond Hall and Bernardo Villa Ramírez
- Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado Sydney Anderson
- Subspecies of the Mexican Red-Bellied Squirrel, Sciurus aureogaster Keith R. Kelson
- Subspecies of the Mountain Chickadee Joseph Grinnell
- Subspecific Status of Two Central American Sloths E. Raymond Hall and Keith R. Kelson
- Summer Birds From the Yucatan Peninsula, Mexico Erwin E. Klaas
- Synopsis of the American Bats of the Genus Pipistrellus E. Raymond Hall and Walter Woelber Dalquest
- Synopsis of the North American Lagomorpha E. Raymond Hall
- Systematics of the Frogs of the Hyla Rubra Group in Middle America Juan R. León
- Systematic Status of a South American Frog, Allophryne ruthveni Gaige John D. Lynch and Howard L. Freeman
- Systematic Status of the Colubrid Snake, Leptodeira discolor Günther William Edward Duellman
- Tadpoles of Bufo cognatus Say Hobart M. Smith
- Taxonomic Notes on Mexican Bats of the Genus Rhogeëssa E. Raymond Hall
- Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope John D. Lynch
- Taxonomic Status of Some Mice of The Peromyscus boylii Group in Eastern Mexico, With Description of a New Subspecies Ticul Alvarez
- Taxonomic Study of the Middle American Snake, Pituophis deppei William Edward Duellman
- Taxonomy and Distribution of Some American Shrews James S. Findley
- Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus John A. White
- Territory in Bird Life Henry Eliot Howard