PREFACE 



ERRATA. 



Preface, p. X, line 20. Text figs. 36 & 37, are from 

 " Science of the Sea," and insert Plates 63 and 

 64, from Charles Darwin's " Coral Reefs." 



Page 25, line 5. " Blue Algae" — should read "Blue- 

 green Algae." 



,, 145. Text fig. 32 — the words "male" and 

 •' female " should be transposed. 



„ 205, line 9. " vulnerable " should read " invul- 

 nerable." 



„ 208, line 4 from bottom. Delete — " with its huge 

 mouth wide open." 



„ 239 line 21, for " Pacific Ocean " read " Southern 

 Ocean." 



, 261, plate 95, in legend "x ca 20 " should read 



X Ca 20- 



V 





have been written by Mr. Russell, and Chapters I (second 

 half), II, III, VI, VII, VIII, IX, XIV and sections of 

 XVI by Dr. Yonge. 



We should like to take this opportunity of expressing 

 our thanks to Dr. E. J. Allen, F.R.S., Director of the 

 Plymouth Laboratory, and to the members of the staff of 



vii 



