YOUNG JACK CRKVALLES 



449 



Scutes. — Range of the mean number of scutes 

 above 100 mm. standard length: about 46 to 56 

 (fig. 29). Ginsburg (1952: 97), working with 

 specimens up to about 426 mm. (converted), gave 

 an upper limit of 54 scutes. Nichols (1938b: 2), 

 examining 28 specimens ranging from 103 to 311 

 mm. standard length, found scutes to vary from 



40 to 50. The developing scutes appear between 

 12 and 13 mm. (figs. 20 and 21). The first scutes 

 to complete their individual development do so 

 at about 19 mm. All scutes of fish above 100 mm. 

 have completed, or nearly completed, their indi- 

 vidual development (fig. 29). 



Lateral line. — Range of mean lateral-line ratio 



01 I I I L 



A . / 



J I L 



J I L 



i I I I 



50 



100 150 200 



STANDARD LENGTH IN MM. 



250 



J I I I I 



80 



"0 



60 



50 



— 40 



a 

 < 



— 30 x 



— 20 



10 



300 



Figure 27. — Caranx crysos and C. dentex: Relation of body depth at pelvic and of head length to standard length. 



