70 PROCEEDINGS OF THE ACADEMY OF [VOL. LXXIV 



mollusks from the desert proper, most of which are still in use for 

 those species. Among the more important works since that time 

 are a furl her paper by Gould ('56), a brief account by Orcutt ('89), 

 some incidental notes by Dall ('96), and Pilsbry ('99), and es- 

 pecially the succession of papers by Stearns (79, '82, '83, '83a, '93) 

 which finally culminated (:01) in a comprehensive monograph of the 

 fresh-water mollusks based principally upon the desert fossils. 

 The occurrence of these fo>ssils in windrows, at varying depths in 

 the friable soil, and in the travertine of the terraces, has been of 

 the greatest interest to the geologist engaged in tracing the past 

 history of the basin, and they therefore receive at least passing 

 mention in many general works on the Desert. There is little 

 doubt that a more truly exhaustive study than has yet been at- 

 tempted will be fruitful of results of the utmost value, not alone 

 to the geologist, but to the systematist, the ecologist, and, thanks 

 to the extraordinary character of the variations passed through 

 by some of the forms, perhaps even to the student of evolution and 

 the geneticist. 



Except in the bibliography given, the present paper touches 

 on the fresh-water mollusks only incidentally. 



2. — BIBLIOGAPHY OF MOLLTTSCA OF THE COLORADO DESERT. 



A.— TAXONOMIC 



Anon. 



'56. Catalogue of the geological collection with descriptions of several 

 of the si ecimens. Reports of explorations and surveys ... for a 

 railroad ... to the Pacific Ocean ... in 1853^, vol. 5, pt. 2. 

 Appendix, p. 344-358, 1856. (List of fossil and recent mollusks given on 

 ]>. 350-354). 

 Bartsch, P. 



:03. A new Iandshell from California. Proceedings Biological Society 

 Washington, vol. 1(1, p. 103-104, June, 1903. (Sonorella waleottiana n. sp. 

 described from Palm Springs). 



:04. Sonorella wolcottiana — a correction. Proceedings Biological Society 

 Washington, vol, 17, p. 101, April, 1904. 



:04a. Notes on the genus Sonorella, with descriptions of new species. 



Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 47, p. 187- 



200, pi. 28 33, October, 1904. (Sonorella baileyi orcutti n. subsp. described 



from Colorado Desert, with discussion and figures of allied Desert species). 



BlNNEY, W. G. 



'65. Land and fresh water shells of North America. Part II. Pulmonata 

 limnophila and thalassophila. Smithsonian Miscellaneous Collections, 

 vol. 7, no. 113, p. i ix, 1 171, text, fig. 1 261, September, L865. 



