Foods, living 1863 



, particulate artificial 313 



, single species 447 



, variety of 310 



Foodstuffs 1030 



Foot 85, 101, 102, 153, 263, 276, 278, 286, 337, 392, 451, 543, 544, 583, 

 635, 782, 1413, 1471 



, anchored 101 



, asymmetry of 85 



, axe-shaped 542 



, bulbous 542 



, dilation of distal end 1824 



, distal end of 153 



, extension of 1821 



, heel of 85 



, hollow of 2055 



into substrate, protrusion of 1824 



muscle, grasped by 1222 



muscles 1036 



of young larger than in adult 975 



, plowshare-shaped 975 



, probing of 573 



swelled 454 



white 89 9 



Force 213 



, prevented from applying 347 



Foreign material surrounded by masses of amoebocytes and walled off 1819 

 Forge River, N. Y. 1033 

 Form 1722 



, dominant 461 



, geometrical 1723 



Formalin 272 



Formation of shell 2140 



Fort Macon, N. C. 390, 1453 



Pierce, Fla. 59, 676 



Fossil bivalve molluscs 529 



shells 775, 1546, 2078, 2141 



425, 456, 516, 776, 1302, 2026, 2079, 2080, 2177 





, analogous to 



776 



Fossils 



5, 50, 158, 415, 



423, 



Fouling 



97, 376, 1047 





i 



prevention of 1120 





Four folds, terminates in 841 

 Fraction C 464 



collector 477 



Fractionation 386 

 Fractions, primary 386 

 Fragmenting 1557 



699 



