250 



H. P. KJERSKOG AGERSBORG. 



immatures). This was no doubt due to the fact that only a few 

 small ones were found, and those found were approaching ma- 

 turity. Curves representing the diameter may also be plotted 

 (Fig. 4, A'B'C'}. In each case the diameter which is measured 



FIG. 4. 



AlEff/ST/C VARIATIO/V 



/ 



A 



A' 



B 



Bf 



r' 



X X 



X X 



3 V a t 7 8 /O // II 13 If 15 H* II /? If 20 21 



in inches from tip to tip of rays along the median axis is plotted 

 on the abscissas, the number of specimens on the ordinates. 



Ritter and Crocker (9) states that out of one hundred specimens 

 that they studied not one was of the i8-rayed stage. Here, how- 



