YOUNG JACK CREVALLES 



429 



collections. Of 2.31 specimens taken, 6.9 percent 

 had rudimentary rays in the dorsal or anal fins, 

 or in both. Six (13.3 percent) of the forty -five 

 dip-net collections containing ruber had specimens 

 with rudimentary rays. These collections were 

 distributed in time and place from April through 

 August and from the Bahamas to off North Caro- 

 lina. Of the six collections containing specimens 

 with rudimentary rays, 22.2 percent of the speci- 

 mens had rudimentary rays. The most aberrant 

 of these had 8 rudimentary dorsal soft-rays and 

 5 rudimentary anal soft -rays; the least aberrant, 

 1 and none, respectively. 



No rudimentary rays were found in the caudal, 

 pectoral, or pelvic fins, although specimens with 

 extremely distorted or rudimentary dorsal and 

 anal rajs frequently also had misshapen caudal 

 - 1 1 1 1 1 1 1 1 1 1 1— 



40 



30 





20 



< 

 o 



O 

 Ld 

 Q. 



10 



and pelvic rays. Other morphometries characters 

 of these fish were within the range of predicted 

 normality. The size range of specimens examined 

 with aberrant rays was 23 to 77 mm. 



Interneural and interhemal spines. — Posterior 

 lateral projections of these spines protrude above 

 the body surface along the bases of the dorsal and 

 anal soft-rays in latus and hippos, at least within 

 the following size ranges, 16.1 to 141 mm. and 

 15.3 to 164 mm. They were not present in this 

 protruded manner in any specimens of the other 

 species. 



Caudal. — 9 + 8 principal rays. A minimum of 

 interspecific and intraspecific variation was found 

 in the ray counts and development of the fin. 



The generic character of paired caudal keels on 



each side of the hotly — one beginning above and 



1 1 1 1 1 1 1 1 1 1 1 1 — 



crysos 



 — ruber 



bartholomaei 



latus 



hippos 



_i i i i_ 



_i i i i_ 



_i i i_ 



_■ , L 



_1 I I L 



25 



50 75 



STANDARD LENGTH IN MM- 



100 



125 



Figure 6. — Comparison of the regression lines for the relation of pectoral length to standard length for five species of 



Caranx. 

 489286 O— 59 2 



