284 



Tlu' prevailing uuinher of rays in botli lakes is II ; 58 per cent, from Turkey 

 lake, and 50 per cent, from Tipi»ecanoe Lake having that number. The number 

 of rays in tlie next highest j)er cent, is 10 for Turkey Lake and 12 for Tippe- 

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



The range of variation is two greater in Turkey T^akc. This may be due to 

 the greater number of specimens from this lake. 



TABLE in. 



u a ci 



a 

 a 

 « 



S a, oj 



Per cent, of specimens having 7 anal rays 

 Per cent, of specimens liaviiig 8 anal rays 

 Per cent, of 6])ecimens liaving ii anal i-ays 

 Per cent, of specimens having 10 anal rays 

 Per cent, of specimens having 11 anal rays 

 Per cent, of sjiecimens having 12 anal rays 

 Per cent, of specimens having 13 anal rays 



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 



