516 



FISHERY BULLETIN OF THE FISH AND "WILDLIFE SERVICE 



50 60 70 80 90 100 110 



HEIGHT FIRST ANAL AS PERCENT OF HEIGHT FIRST DORSAL 



Figure 19. — Mean, standard deviation, and range of the ratio. of height of anterior lobe of first anal to height of anterior 



lobe of first dorsal. 



5 10 



LENGTH 20th RAY FIRST DORSAL (CM.) 



15 



Figure 20. — Mean, standard deviation, and range of the length of 20th ray of first dorsal fin in specimens of more than 



200 cm. fork length. 



condition could arise from rigor mortis or from 

 accidental locking of the joint and thus would not 

 really be a distinctive species character at all. 

 The anatomical work of Nakamura (1938) has 

 established that this fin condition results from 

 osteological structure and not from accidental 

 locking of the fin. Furthermore, after having an 



opportunity to compare maiiina with specimens 

 of ampla and audax in rigor we do not question 

 the usefulness of the character. The stiff fin of 

 marUna can be moved through a limited range but 

 positively cannot be rotated or folded back 

 along the side without breaking. It does, how- 

 ever, move easily in its limited range when not 



