770 P6ez Osuna, F., G. Izaguirre Fierro, R. I. Godoy Meza, F. 

 Gonzalez Farias, and J. I. Osuna Lopez (1988) Heavy metals in four 

 species of filter feeding organisms from the coastal area of Mazatlan: 

 extraction techniques and concentrations. Contam. Ambiental . 4(1):33-41. 



771 P6ez Osuna, F., and C. Marmolejo Rivas (1990) Occurrence and 

 seasonal variation of heavy metals in the oyster Saccostrea iridescens. ELulL 

 Environ. Contam. Toxicol.. 44(-):129-34. 



772 Piez Osuna, F., and C. Marmolejo Rivas (1990) Trace metals in 

 tropical coastal lagoon bivalves Crassostrea corteziensis. Bull. Environ. 

 Contam. Toxicol. . 45(4):538-44. 



773 Page, D. S. (1988) An analytical method for butyltin species in shellfish. 

 Mar. Pollut. Bull. . 20(3):129-33. 



774 Page, D. S., E. S. Gilfillan, J. Foster, and J. Widdows (1990) 

 Tributyltin in Mytilus edulis from coastal locations in Devon and Cornwall 

 (UK) and Maine (US) and its effect on shell morphology. Mar. Environ. Res. . 

 28(1-4):539-40. 



775 Palmork, K. H., and J. E. Solbakken (1981) Distribution and 

 elimination of (9-14C)-phenanthrene in the horse mussel (Modiolus 

 modiolus). Bull. Environ. Contam. Toxicol. . 26(2):1 96-201 . 



776 Pancirov, R. J., and R. A. Brown (1977) Polynuclear aromatic 

 hydrocarbons in marine tissues. Environ. Sci. Technol. . 1 1(10):989-91. 



777 Park, C. K., J. R. Pyen, and S. J. You (1989) Mercury pollution in 

 the Onsan coastal area. Han'guk Susan Hakhoechi . 22(5):233-40 (Korean). 



778 Parrish, P. R. (1975) Toxicity of Aroclor 1254 and its physiological 

 activity in several estuarine organisms. Arch. Environ. Contam. Toxicol. . 

 3(1):22-39. 



779 Pascual, E., and R. Establier (1974) Variaciones del contenido en 

 cobre, hierro, manganese y cine en relacibn con la maduraci6n sexual del 

 osti6n, Crassostrea angulata, de las costas de C^diz. Inv. Pesq. . 38(-):387- 

 95 (Spanish). 



780 Pastor, A., F. Hernandez, J. Medina, R. Melero, F. J. Lopez, and 

 M. Conesa (1988) Organochlorine pesticides in marine organisms from 

 the Castellon and Valencia coasts of Spain. Mar. Pollut. Bull. . 19(5):235-8. 



781 Paul, B. H., and A. J. Cownley (1896) The detection of copper in 

 vegetable substances. Pharm. J. . 2(-):441-2. 



78 



