types and who generously
provided their notes on the specimens when learning of my study, to
Dr. Hobart M. Smith and Mr. Charles M. Bogert for offering helpful
suggestions and for the loan of specimens, and to Mr. Jebb Taylor
for assistance with taking data. The drawings are the work of Mrs.
Connie Spitz; the photographs are by the author.

LITERATURE CITED

CARR, A.

1952. Handbook of turtles; the turtles of the United States,
Canada, and Baja California. Cornell Univ. Press, xv + 542 pp., 37
figs., 82 pls., 15 tables, 23 maps.

DUGES, A.

1888. La Tortuga Polifemo. La Naturaleza, 1(ser. 2):146-147.

1896. Reptiles y Batracios de los E. U. Mexicanos. La Naturaleza,
2(ser. 2):479-485.

FENNEMAN, N. M.

1931. Physiography of western United States. McGraw-Hill, New York,
1st. ed., v-xii + 534 pp., 173 figs.

MILLER, L.

1932. Notes on the desert tortoise (_Testudo agassizii_).
Trans. San Diego Soc. Nat. Hist., 7:187-208.

SMITH, H. M.

1949. Herpetogeny in Mexico and Guatemala. Ann. Assn. American
Geographers, 34(3):219-238, 1 fig.

THAYER, W. N.

1916. The physiography of Mexico. Journ. Geol., 24:61-94, 2 figs.

WOODBURY, A. M., and HARDY, R.

1948. Studies of the desert tortoise, _Gopherus agassizii_.
Ecol. Monogr., 18:145-200, 25 figs., 4 tables.

_Transmitted November 18, 1958._

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