THE NAUTILUS. 79 



Pisidium californicum (Newcomb ?). Swamp and creek at Bluff 

 Lake, common in 1907 [S. S. B.], abundant in 1908 [S. S. B.], and 

 1909 [N. G. S.]. 



Pisidium ashmuni Sterki. Swamp at Bluff Lake [S. S. B., 

 1907]. Identified by Dr. Sterki. 



Specimens of Pisidia have also been found in Kid Creek, San 

 Bernardino Mountains [N. G. S., Aug., 1909], and in Mill Creek at 

 Forest Home, altitude 5,200 feet [S. S. B., July, 1908], but have 

 not as yet been determined by Dr. Sterki. 



Bibliography. 



Bartsch, Paul. Limax maxi7mis L. in California. Nautilus, 

 XVIII, p. 12, May, 1904. 



Berry, S. S. INiolluscan Fauna of the San Bernardino Moun- 

 tains, California. Nautilus, XXI, p. 121, March, 1908. 



BiNNEY, W. G. A Manual of American Land Shells. Bull. 

 U. S. N. M., No. 28, 1885. 



Dall, W. H. Alaska — Land and Fresh Water MoUusks. Harr. 

 Alaska Exp., Vol. XIII, N. Y., 1905. 



Grinnell, Joseph. Biota of the San Bernardino Mountains. 

 Univ. Cal., 1909. 



PiLSBRY, H. A. Notes on Plate XL Nautilus, XXI, p. 133, 

 April, 1908. Valvata humeralis califomica, n. subsp. Nautilus, 

 XXII, p. 82, Dec, 1908. 



Stearns, R. E. C. S. Report on the Land and Fresh-Water 

 Shells Collected in California and Nevada by the Death Valley Ex- 

 pedition, Including a Few Additional Species Obtained by Dr. C. 

 Hart Merriam and Assistants in Parts of the Southwestern United 

 States. N. Amer. Fauna, No. 7 (U. S. Dept. Agric), May, 1893. 



Sterki, Victor. A New Californian Vertigo. Nautilus, 

 XXI, p. 90, Dec, 1907. 



Walker, Bryant. Notes on Valvata. Nautilus, XX, p. 25, 

 July, 1906. 



