Bull. U. S. B. F., 1930. (Due. 1100.) 
Figure 27. — Series of scallops with growth line illustrating the fact that this line is formed in the fall, when scallops are spawn- 
ing and are about 1 year old. The scallop at the upper left-hand corner, with line just formed, was taken October 30; the 
second one, December 1; the third, January 31; that in the lower left corner, February 20; and that in the lower right cor- 
ner, July 23. (1926 and 1927, Fivers Island, N. C.) One-half natural size 
612 
