40 



70 100 



STANDARD LENGTH 



130 

 (MM) 



Figure 19. — Relation of barbel length to standard length of MuUidae of the western North Atlantic. For Pseudupeneua 

 maculatus, large black circle indicates smallest metamorphosed specimen (41.0 mm. ) and large open circle indicates 

 large pelagic form (59.5 mm.). 



Tliere were no segmented rays on 21.6-mm. or 

 smaller specimens. In a 29.0-mm. specimen the 

 5th through the Hth rays were segmented. A 

 34.1 -mm. juvenile had segmentation in the 2d 

 througli the 11th rays. A 50.2-mm. specimen with 

 16 rays had the 2d through the 15th rays seg- 

 mented. The first ray and the last ray were not 

 segmented on any specimens below 103.4 mm., the 

 size at which segmentation was complete. 



Branching began between 21.6 and 29.0 mm., 

 and at 20.0 mm. the fifth ray was branched. A 

 34.2-nim. specimen had five branched rays, the 

 fourth through the eighth. At 38.8 mm., the num- 

 ber of branched raj's had increased to 10, the 3d 

 through the 12th. At 50.2 nun., all but the first 

 two and tiie last ray were branched. The last ray 

 was not branched on any specimen below 103.5 

 mm., the size at which branching was complete. 

 The first two ravs never branch. 



Pelvic. — In the pelvic fin of the 18.5-mni. speci- 

 men none of the six rays were branched. A 

 21.6-mm. specimen had two branched rays, and 

 t hose 29.0 mm. and larger had five branched rays. 



Anal. — The anal fin of the adult has one short 

 spine and seven segmented rays, the last six 

 branched. The seven rays were segmented in an 

 18.5-mm. specimen, but only the last two were 

 branched. At 29.()-mm. the last six rays were 

 branched. 



CaiidaL — The principal ray count on all speci- 

 mens was 15 (i, 7 + 6, i). Secondary ray counts 

 were made on 12 specimens ranging from 18.5 

 through 57.5 mm. In specimens larger than this 

 the secondaiy rays are so overgrown by tissue and 

 scales that counts were unieliable. The secondary 

 ray counts ranged from 8 to 10 in the dorsal lobe 

 and 8 to 11 in tiie ventral lobe. The smallest 

 specimen had 9 dorsal and 10 ventral secondary 



