162 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



60 

 40 



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z 



lU 



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 _l 

 bJ 



-l 1 — I — I I I I I I 1 1 — I — I I I I 1 1 1 1 — I — I I I I I 



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J I I I I I I 







10 20 40 60 100 



STANDARD LENGTH IN MM. 



200 



Figure 34. — Relation of pelvic fin length to standard length. Dots represent study specimens; x, Beebe's specimen: 

 circles, Voss's specimens; triangles, Baughman's .specimens; and large black dots, the unidentified species. 



toral, and pelvic fins develop in size and shape, 

 and dermal spines appear. 



5. From 50 to 100 mm., the snout elongates 

 farther, but the snout extension stabilizes, the 

 dorsal and anal fins further develop in size, shape, 

 and progress toward their eventual division, and 

 dermal spines develop further. 



On the basis of the foregoing observations on 

 growth and development, I have divided the 

 specimens less than 100 mm. in length into three 

 categories. 



The size range below 7 mm. lias been desig- 

 nated "early larval," that period during which 

 the head spines are developing (by 7 mm. all 

 except the pterotic spine have ceased growing), 

 and finfolds have little differentiation of rays. 



The size range from 7 to 20 mm. has been des- 

 ignated "midlarval," that period during which 

 all spine development ceases (at approximately 

 10 mm.), fins receive their full complement of 

 rays and undergo changes in size and shape, and 

 the snout begins to elongate. 



