284 



The prevailing number of rays in both lakes is 11; 53 per cent, from Turkey 

 lake, and 56 per cent, from Tippecanoe Lake having that number. The number 

 of rays in the next highest per cent, is 10 for Turkey Lake and 12 for Tippe- 

 canoe Lake, about 27 per cent, in each case. 



The range of variation is two greater in Turkey Lake. This may be due to 

 the greater number of specimens from this lake. 



70 

 60 

 50 

 40 

 30 

 20 



10 







ft 



10 II 12 13 



Fig. 2. 



TABLE III. 





Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 



of 



f specimens having 7 anal rays 



f stippimpTis Viavincr 8 anal rays 



9 anal rays 



10 anal rays 



11 anal rays 



12 anal rays 



13 anal rays 



ui specimens Having 



of specimens having 

 of specimens having 

 of specimens having 

 of specimens having 

 of specimens having 

 of specimens having 



0.16 



0.16 



1.48 



26.80 



53.43 



14.13 



0.49 



0.77 

 15.50 

 56.21 

 27.13 



0.35 



Dorsal Spines. — Turkey Lake has on an average more dorsal spines, the 

 average being 14.52 for Turkey Lake and 14.23 for Tippecanoe Lakes. Fig. 3 

 represents the curves for this structure. The range of variation is the same, from 

 12 to 17. Although the average number of spines differs but slightly in the two 



