PREFACE 



Eastern seas. He is extremely pleased to see his book published in English. 

 Original scientific papers in Russian have had little publicity outside the 

 u.s.s.R. and quite often works on marine biology or biogeography have 

 appeared in other languages purporting to offer a new interpretation of cer- 

 tain problems, when in fact they had already been examined and interpreted 

 by Russian writers. 



With this book a special effort has been made to make Russian work as 

 widely available as possible to the foreign reader. The author believes that his 

 treatise will be a reliable aid and guide to all who seek access to the rich 

 literature of Russian marine biology. 



L. Zenkevitch 



