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Ocenebra japonica 434 



effect of salinity 435 



manner of drilling shell 435 



menace to Pacific coast native oysters 435 



synonym of Trilonalia 434 



Odhner, N., excretory system 271 



Odlaug, T. O., toxicity of pulp mill effluent 444 



Odostomia, synonym Menestho, ectoparasites of 



oyster 436 



Odostomia bisuturalis 437 



Odostomia impressa 437 



oil, crude, toxicity to fishes 443 



emulsion, use in digestion experiments 228 



oil, pollution 443 



Oka, K., heart physiology 242, 251 



Oka's method of heart stimulation 248 



Okada, K., primordial germ cells 299 



Olsson, A. A., tensilia of ligament 49 



opening of oysters 66 



opening of valves, duration of 172 



organic components of adductor muscle 162 



organic substances in sea water, effect on water 



transport 19' 



organs of reproduction, anatomy 297, 299 



orthoquinone, in tanning of protein 58 



Orton, J. H 16, 32 



adductor muscle 154 



anatomy of 0. edulis 65 



ciliary currents 142 



crystalline style formation 225 



feeding dependent on stage of tide 175 



metabolism and sex change 212 



sex changes 314 



sex change in 0. edulis 314 



Osburn, R. C, bryozoa in Chesapeake Bay 427 



osmoregulation 278 



in Crassosirea 278 



ostia 127 



effect on water transport 1 85, 197 



Ostrea, diagnosis 1, 6 



effect of drugs on ciliary motion 140 



taxonomic characters 4 



Ostrea angasi, prismatic layer in shell 4 



Ostrea chilensis, crystalline style 224 



stomach histology 222 



Oslrea circumpicta, agglutination of sperm 340 



cardial nerves 251 



excised heart 243 



ganglion cells of the heart 242 



glycogen in adductor muscle 162 



heart beat 250 



respiration 214 



specific gravity of blood 265 



Ostrea cucullata, hermaphroditism 314 



labial palps 111 



pallial organ 289 



spawning 306 



Ostrea dendata, heart beat 250 



Ostrea edidis, amino acids 391 



chemical analysis of shell 39 



ciliary tracts of gills 143 



ciliarv tracts in stomach 220 



472 



Page 



crystalline style 224 



diagnosis 9 



electrocardiogram 244 



fecundity 313 



gregariousness of larvae 373 



hermaphroditism 314 



laterofrontal cilia 128 



Linnaeus diagnosis 1 



spawning 306 



sperm balls 302 



setting 37 1 



sex change 314 



stomach histology 222 



striation of muscle fibers 157 



Ostrea eqnestris 4 



diagnosis 12 



hermaphroditism 314 



on buoys 2 



salinity tolerance 5 



salinity range 404 



Ostrea frons, diagnosis 12 



Ostrea haliotidea 2 



Ostrea imbrieata, analysis of adductor muscle 162 



Ostrea laperousi, heart beat 251 



diagnosis 11 



gametogenesis 325 



hermaphroditic gonad 326 



number of larvae in female 313 



ostia 127 



spawning 306 



setting . 372 



Ostrea lurida, sex 314 



shell movements 175 



Ostrea ( A leetryonia) megodon 4, 28 



Ostrea mcxicana 28 



Ostrea mordax 16 



Ostrea permollis, diagnosis 12 



Oslrea sandwiehensis 28 



Ostrea tuberculata 2 



on corals 2 



ostrcasterol, identical with 24-methylencholosterol- 392 



Ostreidae, taxonomy It 2 



Otis, A. B., adrenaline effect on heart 253 



effect of pll on heart beat 251 



ovary, definite 324 



oviparous oysters 5 



ovocyte (oocyte) 303, 325 



mature, size in C. comjnercialis 326 



suppression of development 324 



ovogenesis 325 



o vogonia 325 



ovulation 303-304 



Owen, G., normal axis of shell 25 



oxalocetic decarbohylase, in calcification 99 



oxidase 299 



oxygen consumed and weight 208 



oxygen debt 208, 214 



oxygen tension, effect on respiration 214 



oxygen uptake 205 



and shell movements 208 



and spawning 207 



effect of pH 211 



FISH AND WILDLIFE SERVICE 



