Introduction xv 



serve to give at least a general idea of locations; in future volumes there will be a closer 

 relationship between the localities given in the text and those included on the map. 



The expense incurred in the preparation of this volume has been extensive, and due 

 appreciation and thanks are extended to the Sears Foundation for its share in making publi- 

 cation possible and to the institutions that supported the work of the authors and editors. 

 Income derived from the sales of the volume will be used for the production of the re- 

 mainder of the publication. 



The Editorial Board would like to express its appreciation and gratitude to Yngve H. 

 Olsen, Assistant Editor of the Sears Foundation for Marine Research, for his diligent and 

 able editing of the manuscripts and for the guidance of the publication through the press. 



To Henry Sears the members of the Editorial Board owe a personal and collective 

 debt of gratitude for his understanding and for his unswerving continued support. 



JOHN TEE-VAN 



New York Zoological Society 



