Shell erosion localized 520, 522 



, undergo period of 1176 



, external morphology of 1234 



forced open 2055 



form 1425 



to life habits, relation of 1718 



formation 159, 161, 415, 932, 1006, 2014, 2015, 2016, 2064, 2123, 2140, 2228 



, inhibition of 2016 



fragments afford protection 1253, 1254 

 , function of 529 



growth 97, 102, 415, 475, 1433, 1797, 1798 

 , analysis of 714 



ceases 337 



of oysters and mussels greater in dark 1260 

 711 



294, 555, 789 



, inserts its own 



lacking in mineral content 160 



large 425 



layer 477 



, indentations of outer 415 



rich in CaC0 3 1176 



layers, offsetting of boundaries between 2099 



length 2150 



at end of each year 827 



, shell weight ratio 826 



liquor 232 

 , margin of 108 



marker 4 75 



markings 308 



material, red 833 

 _ matrix 2132, 2133 

 _, mature 161 



morphology 475 



movements 47, 110 7 



muscles 1319 



or gravel beds 910 



per acre 1058 



, piece chipped from edge of 1945 

 of 1108 



'803 



