1922] NATURAL SCIENCES OF PHILADELPHIA 81 



MacDougal, D. T. 



:14. General discussion. Carnegie Institution Washington Publication 

 193, p. 173-182, June, 1914. (An important paper; mentions occurrence 

 of shells of fresh-water mollusks in the travertine on p. 173). 



:15. The Salton Sea. American Journal Science, (4), vol. 39, p. 231- 

 250, text fig. 1-6, March, 1915. (Occurrence of fossil fresh-water mollusks 

 noticed on p. 233). 

 Mendenhall, W. C. 



:09. Ground waters of the Indio Region, California, with a sketch of 

 the Colorado Desert (60th Congress, 2d Sess., House of Representatives 

 Document 1296) United States Geological Survey Water-Supply Paper 

 225, p. 1-56, text fig. 1-5, pi. 1-12, 1909. (Occurrence of shells of fresh- 

 water mollusks on floor of desert mentioned on pp. 18, 19). 

 Orcutt, C. R. 



'90. The Colorado Desert, West American Scientist, vol. 7, p. 55, 1890. 



'90. The Colorado Desert, Tenth Annual Report California State Min- 

 eralogist, p. 899-919, 1890. 



:01. The Colorado Desert, West American Scientist, vol. 12, p. 2-14, 

 July, 1901. 

 Parish, S. B. 



:14. Plant ecology and fioristics of Salton Sink. Carnegie Institution 

 Washington Publication 193, p. 85-114, June, 1914. (On p. 85 mentions oc- 

 currence of shells of fresh-water mollusks in the soil). 

 Veatch, J. A. 



'57. Mud volcanoes of the Colorado Desert. Proceedings California 

 Academy Sciences, vol. 1, p. 104-108, 1857. 



C— WORKS MORE OR LESS EXTRA-L1MITAL, 

 BUT WITH IMPORTANT BEARING. 

 Clapp, G. H. 



:07. Epiphragmophora (Micrarionta) hutsoni n. sp. Nautilus, vol. 

 20, p. 136-137, pi. 9, fig. 1-4, April, 1907. 



:08. New land shells from Arizona and New Mexico. Nautilus, vol. 

 22, p. 76-78, 96, pi. 7, pi. 8, fig. 1-3, December 1908 to March 1909. 

 Edson, H. M., & Hannibal, H. 



:11. A census of the land and fresh-water mollusks of southwestern 

 California. Part 1 — Land Mollusca, Bulletin Southern California Academy 

 Sciences, vol. 10, p. 47-64, 1 pi., July, 1911. (P. 56-57 records Thysanophora 

 ingorsolli from South Mission Canyon, San Bernardino Mts.). 

 Lewis, J. 



'75. [Anodonta dejecta nov.] Field and Forest, vol. 1, p. 26, 1875. 

 '75. Description of a new species of Anodonta. In Yarrow, H. C, — 

 Report upon the collections of terrestrial and fluviatile Mollusca made in 

 portions of Colorado, Utah, New Mexico, and Arizona, during the years 

 1872, 1873, and 1874— Final Report United States Geological Survey West 

 of the 100th Meridian [Wheeler Exp.], vol. 5, p. 952-953, 1875. {Anodonta 

 dejecta n. sp.). 

 Pilsbrv, H. A. 



:13. Notes upon some Lower California!! Helices. Proceedings Academy 



