SINKERS. 



175 



Fig. 307. — A quartzite sinker of conoidal form, with a knob traversed by a 

 groove, which doubtless was intended to facilitate the adjustment of the line. 

 From Middleborough, Massachusetts. Presented by Professor J. W. P. Jenks. 



Fig. 303.— California. (304C9). 



Fio. 304.— Massacliusetta. (0711). 



Fio. 305.— Massachusetts (0505). 



Fio. 30G.— Florida. (10S32). 



Fig. 307.— Massachusetts. (6516) Fio. 308.— California. (21875). 



Figs. 303-308.— Stone sinkers. 



Fig. 308. — This specimen, which consists of serpentine, exhibits an almost 

 globular bulge. In this sinker, as in others already described, the neck portion 

 of the knob is hardly narrow enough to allow a firm attachment of the line, for 



