118 Racial Studies in Fishes 



analysis are available. I hope therefore to revert to the question on 

 a subsequent occasion, after conclusion of the experiments, of which the 

 individual offspring analyses briefly referred to above form a part. 



DESCRIPTION OF PLATE VII. 



Fig. 1. Zoarces viviparus, L. Sketch of a specimen about 26 cm. in length from the 



Sound. Number of vertebrae 121, of hard rays 12, and of pigment spots on dorsal 16. 

 Fig. 2. Zoarces viviparus, L. Sketch of a specimen about 25 cm. in length from 



Roskilde Fjord, Sealand, Denmark. Number of vertebrae 105, of hard rays 5, and of 



pigment spots on dorsal 11. 



Fig. 3. Zoarces viviparus, L. Sketch of a specimen about 33 cm. in length, from Gullmar 

 Fjord, Sweden. Hard rays lacking. Number of vertebrae 109. 



In all three figures the foremost pigment spot is situated on the front margin of the 

 dorsal fin. 



Note. In calculating the probable fluctuation of the average number of vertebrae etc 

 ; following formula was employed, viz. =*= -p x 0-67449 x 5. 1 

 in brackets after each average value of the character in question 



the following formula was employed, viz. =*= -p x 0-67449 x 5. This value is always given 



