North American Recent Soft-Shelled Turtles (Family Trionychidae)

by Robert G. Webb

1929. Paleocene vertebrates from Alberta. Amer. Jour. Sci., 17(98):162-178, 5 figs., February.

1930. A new species of Aspideretes from the Paskapoo Formation of Alberta. Amer. Jour. Sci., 20(115):27-32, 3 figs., July.

1934. Fossil turtles from Saskatchewan and Alberta. Trans. Roy. Soc. Canada, 28:101-11, 6 pls., 1 table, May.

Ruthven, A. G., Thompson, C., and Thompson, H.

1912. The herpetology of Michigan. Michigan Geol. Biol. Serv., Publ. 10, Biol. Ser. 3, 161 pp., 55 figs., 16 pls.

Schmidt, K. P.

1924. Emory's soft-shelled turtle in Arizona. Copeia, 1924(131):64, June 30.

1945. A new turtle from the Paleocene of Colorado. Fieldiana Geol., 10(1):1-4, 1 fig., September 19.

1946. On the zoogeography of the Holarctic Region. Copeia, 1946 (3):144-152, 1 map, October 20.