CAXADIAX FISillERIES ^XI'KDlTlOy, lOUl.'t 



435 



The comparative variability in the mimlx>r of jaws in individuals of the same size 

 makes it necessary to examine larger numbers of individuals than would otherwise be 

 the case. Although the number is not very large, it is fairly evident from the figures 

 given that there is a very gradual but steady increase in the number of jaws, and this 

 is irrespective of the type, individuals of the same length in the two types having 

 equal numbeis of jaws (or slightly more in the larger type). 



In the ease of the tail percentage there is a decrease with age. The following are 

 the result? of measurements of the percentages in the two types of S. serratodentata. 



Boreal Water. ("Acadu" Station 38.) 



For the larger sizes it was necessary to examine specimens from another point. 

 Boreal Water. ("Acadl\" Station 85.) 



Tropical Water. ("Acadia" Station 75.) 



Length (mm.). 



Tail percentages. 



12 



23 

 23 

 23 

 24 

 24 



For the sm.allest sizes specimens from another station were taken. 



6551—32 



