510 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



55 60 65 70 



SNOUT LENGTH AS PERCENT OF HEAD LENGTH 

 Figure 12. — Mean, standard deviation, and range of ratio of snout length to head length. 



75 



70 



60 - 



50 



o 



CD 

 O 



40 



30 



O 



20 



10 



10 



20 



30 



70 



80 



90 



40 50 60 



SNOUT TO ORBIT (CM.) 

 Figure 13. — Relation of length of mandible (to the joint) to snout from tip to orbit. (Measurements by POFL) 



100 



different type of growth in ampla than in the other 

 two species. The mandible of ampla tends to 

 become markedly shorter in relation to the snout 

 as the fish grows, whereas in the other two species 

 the gi'owth is nearly isometric. 



A similar relation is apparent when regression 

 lines are fitted to the published data (fig. 14) of 

 Gregory and Conrad (1939) and Conrad and 

 LaMonte (1937). Their data cover a much 

 smaller range than the POFI data but the same 



