Fig. 91. The curve represents the growth of the average Massachusetts scal- 

 lop from 1905 to 1907. Notice the rapid growth from July to December in 1905, 

 and the complete cessation during the winter months. During the second summer 

 comes another period of rapid growth, which ceases about Dec. 1, 1906. The normal 

 life of these scallops ends some time in March or April, 1907, but a few often pass 

 the two years' mark. The growth of these old scallops is represented by the broken 

 line in the diagram, summer growth starting about May 1. The figures on the 

 right represent the size of the scallops in millimeters (25.4 millimeters equal 1 inch). 



Average Scallop (Millimeters). 



Pig. 92. The three curves, A, B and C, represent the growth of the average 

 scallop in the three localities of Buzzard's Bay, Cape Cod and the islands of 

 Martha's Vineyard and Nantucket, respectively. For convenience, the start is 

 considered as uniform, although there is several days' difference in the spawning 

 season. The difference in growth at the various dates can be determined by refer- 

 ring to the figures on the right, which represent the size of the scallop in milli- 

 meters (25.4 millimeters equal 1 inch). 



Growth (Millimeters) . 



