PLATE 17 
Fig. 51. Rana toylii sierrae and Bufo canorus ($), from Porcupine Flat, 
Yosemite National Park, photographed June 27, 1915. 5 %oo natural size. 1690. 
Fig. 52. Portion of fragmented egg mass of Rana pipiens, from 2 miles east 
of Dixieland, Imperial County, March 28, 1923, photographed after preservation. 
Natural size. 
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