114 



Racial Studies in Fishes 



a = ll?-S3 {±0-55). 



n=112-36{±0-'i2). 



a = 109- 48 {±0-i5}. 



Fig. 8. Zoarces riviparuf, L. Number of vertebrae. Three individual offspring analyses 

 of gravid females from the 1914 population at St. 31, Ise Fjord, Sealand, Denmark ; 

 the same population as shown in Fig. 4. On comparing with Fig. 4 it will be seen that 

 the number of vertebrae in individual offspring samples may differ greatly from that 

 of tlie population. For each of the graphs of offspring samples, tlie number of vertebrae 

 in the mother is noted. 



