OF MASSACHUSETTS. 



85 



of 



(Millimeters). 



Grou-tli in Various Localities.- -The growth of the scallop is largely 

 determined by its environment. Owing to the diversity of natural 

 conditions within small bodies of water more definite conclusions can 

 be drawn from special localities than by comparing one locality or 

 section with another, owing to the difficulty of determining the average 

 growth for so large an area. Nevertheless, it is of interest to compare 

 the growths in the different parts of the State in a general way, without 

 making too fine a distinction between the individual towns. The follow- 

 ing figures are based on a large number of measurements of several 

 sets : 



Size of Scallops (Millimeters'). 



Comparison of the Different Sets. --In the second table given under 

 the average Massachusetts scallop a comparison of the different sets 

 can be found for the whole scalloping district. A better idea of the 

 variation can be given in comparing the sets for four years in the same 

 locality, the Powder Hole : 



