20 24 26 



STANDARD LENGTH (mm) 



Figure 18. — Relation of snout-anus length to body length in developmental stages of 



Sebostes spp. 



< 



O 



.*■ 



» .d*^ •erf' 



20 21 26 



STANDARD LENGTH (mm) 



Figure 19. — Relation of pectoral fin length to body length in developmental stages of 



Sebaatet spp. 



of S. jordani, the number of ventral melanophores ranged 

 from 21 to 27 with a mean of 23.7 ± 1.75 SD. Larvae of S. 

 marinus differ also from those of the American form and 

 S. viviparus in lacking the one to several caudal 

 melanophores present in these latter species. 



The dorsal and ventral midline pigment series of S. 

 marinus larvae have opposite fates. The ventral series 

 becomes embedded in the developing musculature and 

 obscured by the developing anal fin. At the completion of 

 notochord flexion only those melanophores posterior to 



the anal fin are visible. The dorsal series is augmented 

 anteriad and in 9-mm larvae divides into two streaks, 

 one on each side of the developing dorsal fin. When the 

 larvae reach 14.5 mm the streaks extend anteriad along 

 the entire dorsum. 



In addition to the initial pigment pattern, 

 melanophores are added gradually to the head region. In 

 9-mm larvae a pair of melanophores appears on the ven- 

 trolateral surface of the medulla, the olfactory region of 

 the brain becomes covered with a patch of melanophores, 



30 



