T.\BLE 2. — Ef:liin(iU(l conccnlratioHs (TL,„ values), caliii- 

 lated by interpolation from data in table 1, at which 50 

 percent of the eggs of oysters and clams develops normally 

 or 50 percent of Ike larvae survives 



LITERATURE CITED 



Bond, C.\rl E., Robert H. Lewis, and John L. Fryer. 

 1960. Toxicity of various herbicidal materials to 

 fishes. Robt. A. Taft Sanit. Eng. Cent., Tech. 

 Rep. W60-3: 96-101. 

 BuiLER, P. A., A. J. Wilson, Jr., and A. J. Rick. 



1062.. Effect of pesticides on oysters. Proc. Nat. 

 Shellfish. Ass. .51 ; 2,3-32. 



COTT.VM, Cl.^RENCE. 



1960. A conservat-ionist's views on the new insec- 

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 D.wis, H. C. 



1960. Effects of some pesticides on eggs and larvae 



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mercenaria). Commer. Fish. Rev. 23(12): 8-23, 



DouDOROFF, Peter, M.\x Katz, and Cl.\rencb M. 



T.VRZWELL. 



1953. Toxicity of some organic insecticides to fish. 

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1960. The toxicity of organic phosphorous and 

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Loos.vnoff, \'. L. 



1961. Recent advances in the control of shellfish 

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Loos.vNoFF, X. L., and H. C. D.wis. 



1963. Rearing of bivalve moUnsks. In F. S. Russell 

 (editor). Advances in Marine Biology 1: 1-136. 

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Loos.vNOFF, V. L., C. L. M.u:Kenzie, Jr., and L. W. 

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1960. Use of chemicals to control shellfish predators. 

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 Thim.vnn, Kenneth \'. 



1964. Pesticides and the P. S. A. C. BioScience 14 

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Ukeles, Ravenn-\. 



1962. The effect of several toxicants on five genera 

 of marine phytoi)lankton. Appl. Microbiol. 10: 

 532-537. 



EFFECTS OF PESTICIDES OX DEVELOPMENT OF CLAMS AND OYSTERS 



403 



