Abstract
Through the courtesy of Mr. John Mohr of the University of California, the writer has had the opportunity of examining a collection of helminths taken from a number of species of California amphibians. One new species of Spironoura was among the forms studied, and several new hosts are recorded for some of the known species. Cosmocercoides dukae (Holl, 1928) Travassos, 1931, occurred in three specimens of Bufo canorus (two specimens collected at Tioga Pass, Yosemite National Park, by T. P. Maslin on August 24, 1939, and one collected at Tenaya Lake, Yosemite National Park on November 14, 1939). Cylindrotaenia americana Jewell, 1916, was taken from Bufo canorus (Tenaya Lake, Yosemite National Park, November 14, 1939). Spironoura pretiosa Ingles, 1936, was found in Rana aurora draytonii (collected at Hecker Pass, Santa Clara Co., California, by T. P. Maslin on August 5, 1939), Rana boylii sierrae (collected at Elizabeth Lake, Yosemite National Park, by T. P. Maslin on August 24, 1939), and in Bufo sp? (undescribed species of toad, near Bufo boreas, taken by T. Rodgers and R. R. Miller on May 30, 1937, in Deep Springs Valley, Inyo Co., California).
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