The Growth of the Soft Clam 309 



a long reef has grown up, on which lay the prodigiously 

 abundant set. Several clammers have told me that fre- 

 quently such sets occur here. Upon an area of 600 to 

 700 feet long, tapering at the ends, and about 150 feet 

 wide in the center, I found a set of young clams from 

 1,000 to 5,000 per square foot. From an average square 



FIG. 61. Position of dense set of 

 young of Mya in a small bay. 

 Dotted line marks the low-tide 

 level. J. L. Kellogg. Report of 

 Special Shell Fish Commission, U. 

 S. F. C. 



foot of sand in which every clam was burrowed out of 

 sight, and in which I counted roughly 1,000 holes, I dug 

 1,937 clams, averaging about half an inch in length. 

 From a square foot of sand into which the clams had not 

 completely burrowed I sifted 2,486 clams. Roughly 



