61 



days previously. It was probably not attached longer 

 than from seven to ten days and is already as large as a 

 young European oyster ligured by Mobius as being a 

 month old. I have sketched it both natural size and 

 enlarged about three times to show the tiny larval shell 

 as a sort of rounded point at the apex of the upper valve. 

 Fig. 9 shows a young oyster supposed to be 

 not over twenty days old, and the one repre- 

 sented in Fig. 10 is known not to be over 44 days 

 Fig. 9. old, Fig. 11 is not over 48, Fig. 12, 79, and Fig. 

 13, 82 days old. Fig. 14 represents a very: tine specimen 



Figure 10. Figure 11. Figure 12. 



taken from the inside of a wreck at Cape May, N. J., by 

 my friend Mr. John Ford, and is supposed to be not over 



Figure 18. Figure 14. 



2^ to 8 months old from the fact that it avjis c()lle(;ted in 



