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pilocarpine, effect on cilia 140-141 



effect on heart 253 



Pinclada 41 



aragonite in shell 104 



closing of valves 165 



Pinna 41 



Pinna nobitis, contraction of muscle 159 



Pinnotheres oslreum 425 



Pisaster ochraceus 438 



plankton, seasonal changes in volume 408 



plankton trap, for larvae 369 



used in quantitative plankton sampling 409 



plaster of paris, injection with 66, 123 



Plateau, F., elasticity of ligament 59 



power of adductor muscle 176 



Plalymonas tetrahele, food of larvae 374 



Pogonias crotnis, destructive to oyster 439 



Poisseul's formula 145 



polar bodies 344 



pollen, as food 232 



pollution, definition of 441 



evaluation of 445 



Federal program of investigation 442 



from duck farms 235, 444 



lack of legal definition 441 



oil 443 



pulp mill 443 



radioactive waste 445 



Polydora, sp., mud gathering worms 412 



Polydora larvae 423 



Polydora ciliala 422 



Polydora ligni 413, 422 



amount of mud collected by 423 



destruction of oysters in Delaware Bay 423 



egg laying 422 



mud gathering mechanism 423 



Polydora wehsleri 422 



effect on oysters 424 



invasion of oyster shell 412 



life history 422 



polyhaline zone 404 



Pomerat, C. M 372 



Porter, K. R., electron micrograph of rootlets in 



DeRobertis, etal 133 



Portier, P., vitamins in oysters 391 



positive factors of environment 399 



summation of 445 



potassium, effect on frontal cilia of Mytilus 139-140 



effect on heart beat 251 



Potts, F. A., adductor muscle 154 



digestive diverticula 226 



Power, E. A., yield of oysters 382 



power of adductor muscle 175 



in air 177-179 



in sea water 178-179 



methods of measuring 176 



predation, evaluation of 440 



predators 430 



Prenant, M., calcification in Helii 95 



minerals of calcium carbonate 103 



Prescott, B 343 



pressure, effect on ciliary motion 142 



474 



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pressure, inside the gills 146 



pressure bomb, of Marsland 142 



Price, T. J., radioactive waste 445 



zinc absorption 390 



Price, W. A., sedimentation 412 



principal axis, instability of 29 



prismatic layer 37, 93 



Pritchard, D. W., definition of estuary 400 



mechanism of transport of larvae 402-403 



setting 369 



types of estuaries 402 



prodissoconch 6, 355, 357, 364, 365 



definite 6 



C. rhizophorae 365 



C. virginica 365 



0. edulis 366 



0. lurida 366 



primitive 6 



Pycnodonie hyotis 364 



productivity of oyster bottoms, evaluation of 445-446 



method of scoring 445-446 



productivity of sea bottom 398 



promyal chamber 4, 71, 75, 123 



cast of 124 



importance of 123 



in Crassostrea oysters 124 



relation to water turbidity 124 



relative size of 124 



propionic acid, role in calcification 99 



Prorocentrum micans, undigested by oyster 234 



Prosser, C. L., urine formation 275 



proteins 381 , 382 



content 390 



in adductor muscle 164 



in blood plasma 278 



prototroch 355-356 



pro vinculum 364 



provitamin D., in Modiolus demisus 391 



Prussian blue reaction 225,264,388 



Prym.nesixim parvum, toxic to larvae 375 



Pryor, M. G. M 58 



Prytherch, H. F., larval development in C. virginica. 355 



Nematopsis ostrearum 419 



rearing of larvae 374 



setting 366, 369 



Przylecki, St. J., excretion of nitrogen in Anodonta. 277 



Pspudolamellibranchia 121 



pseudopodia, bristle, of granulocytes 262 



Pseudostylochiis ostreophagus 439 



perforation of oyster shell 439 



pulp mill effluent, depression of ciliary action 443-444 



effect on opening of oyster valves 443 



Purdie, A., crystalline style 224 



Piitter, A., significance of dissolved organic matter. 198 



Puys^gur, M., food of oyster 231 



Pycnodonie, definition of gen us 7 



rectum, position of 4 



shell 4 



Pycnodonie hyotis, diagnosis 12 



pyloric process 70 



Pyramimonas grosii, as food of larvae 375 



FISH AND WILDLIFE SERVICE 



