294 



TABLE XI. 



First 

 Year. 



Second 

 Year. 



Third 

 Year. 



Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 

 Per cent. 



of epecimens 

 of specimens 

 of specimens 

 of specimens 

 of specimens 

 of specimens 

 of specimens 



having 

 having 

 having 

 having 

 having 

 having 

 having 



12 dorsal rays 



13 dorsal rays 



14 dorsal rays 



15 dorsal rays 



16 dorsal rays 



17 dorsal rays 



18 dorsal rays 



0.84 



1.69 



40.72 



53.39 



3.38 



0.42 



2.96 



30.50 



52.53 



11.48 



0.84 



1.21 



22.35 



55.69 



16.73 



3.25 



0.40 



Dorsal Spines. — The averages for this structure are 14.69 for the first year, 

 14.39 for the second and 14.65 for the third year, the first and third years being 

 almost identical, and the second year having a fewer number. Fig. 9 represents 

 the curves for this structure. The curves of the first and third years are almost 

 identical, both showing a preference for 15, with about 35 per cent, for 14. The 

 second year shows as decided a preference for 14, about 35 per cent, for 15. This 

 structure varies from 13 to 16 in the first year specimens, from 12 to 17 in the 

 second year specimens and from 13 to 17 in the third year specimens. Table X 

 contains the summaries for this structure. 



6o — 



50 



40 



30 - 



± 



m 



— 



I 



12 13 



IS 



f*£ 



Fig. 



