JINGLE SHELLS 



ENCRUSTING 

 BRYOZOANS 



CALCAREOUS 

 TUBEWORMS 



BARNACLES 



JAN. FEB. MAR. APR. MAY JUNE JULY AUG. SEPT. OCT. NOV. DEC. 



LEGEND 

 PERIOD DURING WHICH ATTACHMENT OCCURS 

 PEAK ATTACHMENT PERIOD 



FIGURE 15. SETTING PERIODS OF PREDOMINANT ATTACHING 

 ORGANISMS 



25 



20 



E 

 E 15 



1 



1 1 



1 1 |U 



1 









y" 











X" 











' 



u 





— 



o ^ 



o o^ 









o 





•- — 







/ 











— / 









— 



/ 



y^» 









/ 











t V 









— 



/ / 











/ 



\ 1 



1 1 1 



1 





12 3 4 5 6 



GROWING PERIOD (months) 



o 



LEGEND 

 AVERAGE DIAMETER (mm.) 

 MAXIMUM DIAMETER (mm.) 



FIGURE 16. JINGLE SHELL GROWTH 



21 



