MALES. 



25 27 29 31 33 35 37 39 -f/ 43 45 47 49 SI S3 SS 57 



IMMATURE FISH 

 MATURE FiSh . 



Fig. 1, — Showing the length frequencies in 2 cm. groups of 2,101 male 

 plaice. Barents Sea, August, 1907. 



