ANNUAL OVARIAN CYCLE 



Whaley, Margaret Celeste. 1930. Spermatogenesis and seasonal changes in the testes of 



Acris giylltis. Thesis, University of Oklahoma Library. 

 Wright, Albert Hazen. 1932. Life-Histories of the Frogs of Okcfinokee Swamp, Georgia. 



North American Salienta (Anura) No. 2. The Macmillan Company, New York. 

 Wright, Anna Allen, and Albert Hazen. 1933. Handbook of Frogs and Toads, Comstock 



Publishing Company, Ithaca, New York. 



Time of Fixation 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



TABLE I 



Ratios of Percentages of Ovarian to Total Volume 

 Boiiiii Fixation 



Formalin Fixation 



AVERAGE RANGE OF 

 PERCENTAGE PERCENTAGES 



1.43 



3.28 



0.63- 2.16 



12.28-16.81 

 3.62-27.18 

 4.94-28.86 

 3.96-11.11 



2.94- 3.72 



Represents only one specimen. 



TIME OF FIXATION 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



TABLE II 

 Comparative Diameters of Oocytes 



DIAM. OF LARGEST OOCYTE 



0.408 mm. 

 0.552 mm. 

 0.660 mm. 

 0.600 mm. 

 0.864 mm. 

 0.852 mm. 

 0.876 mm. 

 0.840 mm. 

 0.320 mm. ' 

 0.300 mm. 

 0.360 mm. 

 0.252 mm. 



DIAM. OF AVERAGE OOCYTE 



0.324 mm. 

 0.420 mm. 

 0.540 mm. 

 0.564 mm. 

 0.672 mm. 

 0.720 mm. 

 0.804 mm. 

 0.840 mm. 

 0.160 mm. 

 0.240 mm. 

 0.264 mm. 

 0.192 mm. 



Explanation of Figures 

 The photomicrographs included here are those made of sections of the ovaries taken 

 from specimens of Acris crepitans, collected and fixed during the months indicated below. 

 The magnification of Figures 2-8 is X96; that of Figure 1 is X736. 



Figure 1. Section through portions of several oocytes from an ovary fixed in January, 



showing the membranes of the oocytes. 



Figure 2. Section through ovary of a frog fixed in September. 



Figure 3. Section through ovary of a frog fixed in October. 



Figure 4. Section through ovary of a frog fixed in November. 



Figure 5. Section through ovary of a frog fixed in February. 



Figure 6. Section through ovary of a frog fixed in March. 



Figure 7. Section through ovary of a frog fixed in July. 



Figure 8. Section through ovary of a frog fixed in August. 



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