PREFACE. 



THE labour of compiling this book was undertaken by me in 

 the sincere hope that when finished it would be useful. It is 

 meant to link on to the great bibliographical work of Carus and 

 Engelmann, and to cover the time from the publication of their 

 list to the close of 1883. Though I cannot attempt to extend the 

 Catalogue to other groups, I hope to issue a supplement containing 

 omitted titles and recent works in the beginning of next year. 



In a work of this kind, there can be no such thing as absolute 

 completeness. I know that there are many omissions to be 

 discovered in my list, but I must beg those who use it to judge 

 these leniently and to help me to make them good. I shall 

 acknowledge gratefully and publish in my supplement all additional 

 titles that may be sent me. 



I have already to thank the following for help given : Prof. 

 W. J. Sollas and Mr S. O. Ridley for additional titles of papers 

 on Sponges ; Mr T. Hincks for additions to Hydroida ; Prof. Alleyne 

 Nicholson for many additions in the sections on Graptolites and 

 Corals ; Prof. Herdman for some titles in Tunicata ; and especially. 

 Mr H. B. Brady, who sent me advance proofs of his Bibliography 

 of Foraminifera (Challenger Reports), from which I drew many 

 important additions, and who read through my own proof-sheets on 

 Protozoa. 



I am also indebted to Dr Spencer Cobbold for a good 

 many titles taken from the bibliographical lists in his books 

 on parasites. 



