758 



Siderastrea, 39 



Sika deer, antlers, 340, 343, 347, 354, 



356 

 Siliceous bodies, sponge, 32 

 Siliceous spicules, clionids, 30 

 Silicon, 161 



worn sheep teeth, 165 

 Siniim per.spcctivum, 61, 67, 73, 86 

 Siphonal tissues, bivalves 



calcium carbonate secretion, 15 



unicellular algae, 16 

 Sipunculid worms, 3 



bristles, 56 

 Skeletal carbonates, 25 



coral reefs, 49 

 Skeletal debris, coral reefs, 46, 47 

 Skeletal diseases, 385, 453 



summarv, 438 

 Skeletal fractures, 431 

 Skeletal kinetics, 430 

 Skeletogenesis, corals, light intensit\ , 



51 

 Skeleton 



metabolic diseases, 453 



tvn-no\er, 453 

 Skull 



resorptive sites, 485 



trabecula, 547 

 Small osteocytes, 549 

 Snail, 57 



accessorv boring organ, sec ABO 



boring mechanism, 55, 86 



chelation, 647 



demineralization mechanism, 55, 56 



demineralization organ, see ABO 



drilling site, 57 



metabolite signal, 57 



muricid, 56 



naticid, 56 



radula, 4, 56, 57, 81, 83 



radular denticles, 57, 60, 71, 81,. 86 



shell boring, 55, 58, 59 



species, 61 



tentacles, 63 

 Snail boring 



chemical action, 57 



living prey, 71 

 Snail boring organ, see ABO 



SUBJECT INDEX 



Snail drilling, see Snail boring 



Squirrel, Arctic ground, 286 



Societv for Crippled Children, 440 



Sodium versenate, 75 



Soft drinks, 99 



Soft x-rays, 474 



Soft-shelled clam, 9 



Soil salt solution, root hairs of plants, 



639 

 Sole of foot, muricids, 56 

 Solubility 



apatite, 276 



bone, 637 



bone mineral, 563, 569 



enamel, 138, 255 

 Solubility of minerals, changes in pH, 



584 

 Solubility product 



calcium fluoride, 256 



measurements, 256 

 Solubility rates, enamel, 255 

 Soluble collagen, irradiation, 425 

 Soluble matrix, enamel caries, 184 

 Solution of collagen, 503 

 Solution to solid, ratios, 254 

 Solvent action, pus, 647 

 Sound dentin, collagenous fibrils, 200, 



201 

 South America, seasons of antler shed- 

 ding, 349 

 South American deer, 350 

 Space travel, hibernation, 285 

 Specialization, rock-boring bivalves, 8 

 Specific activity 



collagen, 675 



collagen fractions, 678 

 Specificity, caries initiation, 272 

 Spectrographic analyses, sheep's teeth, 



161 

 Spectrum of dento-alveolar destruc- 

 tion, 92 

 Spectrum of \ertebrate hard tissues, 



91 

 Spermatogenesis, antler shedding, 359 

 Spinal osteoph\tes, 436 

 Spine, crush fractures, 454 

 Spirasters, 30 

 Spisula solidissima, 62, 75, 86 



♦H 



