PREFACE. 



The Third Part of the ' Catalogue of Marine Polyzoa ' has been pre- 

 pared by Mr. George Busk, F.R.S., the Author of the two preceding 

 Parts, which contain an account of the Chilostomatous Polyzoa. 



Although its preparation was commenced many years ago (in 

 fact, soon after the publication of Part 2), its completion was delayed 

 by the difficulty of the subject, by repeated acquisitions of addi- 

 tional specimens, and by the manifold other engagements of the 

 Author. The execution of the Plates (all of which were drawn, 

 and many also lithographed, by the Author himself) was another 

 cause of delay. 



There cannot be any doubt that the present Catalogue will be 

 found to contain only a small proportion of existing species ; but it 

 is hoped that it will serve as a guide to collectors and students at a 

 time when more attention is paid to these Zoophytes than formerly. 



ALBERT GUNTHER. 



British Moseum, 

 Feb. 6, 1875. 



