General Discussion 



39 



The last group in the short larval group comprise two species; the southern 

 meadow frog and the gopher frog. These have transformation sizes from 

 18-35 (average 23-30 mm.) larger vitelh if anything than the winter (long 

 larval) group and minimal larval periods of 67-85 days. 



We wished to see if the larval period lengths in any way corresponded 

 with the relation of the egg diameters (vitelli) to the transformation sizes. 

 We divided the minimum transformation size by minimum vitellus size for 

 column one. For column two we used the maximum transformation size 

 and maximum vitellus. Column three is the mean of the two. The order of 

 this table (Table 15) accords quite closely with the table of larval period 

 lengths and there is surely a relationship. For example in the table a trans- 

 formed solitary spade-foot is in body length only six times as long as the 

 diameter of the egg vitellus from which it came. Or a transformed bullfrog is 

 thirty-five times as long as the diameter of the egg vitellus from which it came. 



Table 15 



TADPOLES 



(Pis. X, XI, XII, XIII, XIV) 



The following table of tadpoles: — total length, greatest length of body, and 

 tail, greatest depth of body and transformation size reveals a correlated 

 ascending scale for all five characters. Usually the body length of a mature 

 tadpole will be sHghtly greater than the average transformation size, but in 

 several instances the same. Wherever it is smaller than the average trans- 

 formation size we have added the range of transformation size. Usually in 



