DEMINERALIZATION MECHANISM OF BORING GASTROPODS S7 



was a reflection of the degree of alteration of the shell rather than 

 of species difi^erences in the ABO and the shell substrates. 



Acknowledgments. This investigation was supported in part by a grant 

 to the senior author from the United States Fish and \\'ildlife Service and 

 in part by a grant to the Systeniatics-Ecology Program of the Marine 

 Biological Laboratory from the Ford Foundation. 



The research of the senior author was conducted successively at the 

 Department of Zoology, Chapel Hill, and the Institute of Fisheries Be- 

 search, Morehead City, Universitv of North Carolina; at the United States 

 Bureau of Commercial Fisheries Biological Laboratory at Oxford, Mary- 

 land; and at the Woods ffole Marine Biological Laboratory. Acknowledg- 

 ment is gratefully made for courtesies extended him at these institutions. 

 Thanks are also due Mr. Michael Castagna, Mr. Thomas C. Carver, and 

 Mr. George W. GrifRth for collecting large quantities of Urosolpinx cinerca 

 follyensis and Eupleura caudata etterae; to Mr. Langley Wood and Dr. 

 Everett C. Brett for diving for Miirex fulvcscens; to Dr. Juan A. Bivero 

 for shipping M. brcvifons from Puerto Bico; and to Dr. Paul S. Galtsoff 

 for reading and commenting on the manuscript of this paper. 



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