FLOUNDERS OF GF.^•US PARALICHTHYS AND RELATED GENERA 

 Taulki;. — Fri<iii( iirji ilixfriljiilioii hit iiiiiiiIk r of lailx in llii dursiil fin 



275 



/8 



IC 



14 



'A 



y. /z 



~ '0 



§ (> 



't Z 

 Figure 



71 7Z 15 If 7S 76 77 78 79 80 81 8Z 83 8f 85 86 87 88 89 90 91 9Z 95 94 9S 96, 



NTMIIKR (IF DOKSAL KAVS 



3. — Frequency ilislrilmtion liy iiunilier of dorsal rays of iliree eoiuinnii east-coast species of I'ltnilirhtliiis. Nuiii- 

 lier of siiecinieiis: 11(1 dciitiilKx, 140 li IlKi.slii/iiid, ll)".> iilhiiiiiltii. 



roiiorh (lata Ii(>fofe attciiipting to segregate the 

 specimens into tlieir respective species. .V mere 

 inspection of figure -4 siiows convincingly how 

 the specimens are massed into thice fairl}- well 

 (lefineil gi-oiips. These tliree gionps represent: 

 (1) alhhjiitta showing a correlation of low gill 

 raker and fin ray counts; {•!) lethoKtignui having 

 a combination of rehitively few gill rakers and 

 many fin rays; (3) thutntiiH being cliaracterized 

 by relatively many gill rakers in correlation with 

 many fin rays. 



Wliile tlie hulk of the specimens are concen- 

 lral('(l at tiiree well sepaiiUed legions, smalU'r 

 numbers of specimens radiate diffusely from ilie 

 I hree centers of concentration and it is not possible 

 to draw sharp lines of demarcation sejiarating the 

 three species by these characters akine. The 

 proper placement of specimens at or near tlie 

 border line is discussed on page •2S'2. After sucli 

 somewhat doubtful specimens are properly placed 

 the boundaries may be drawn between the species 

 witli assui'ance, and tliev are indicated \\\ a broken 



