PREFACE 



THE present Catalogue, by Dr. J. W. Gregory, F.G.S., 

 forms an acceptable addition to those previously printed, 

 by order of the Trustees, upon the various groups of fossils, 

 both Vertebrate and Invertebrate, preserved in this Depart- 

 ment, and of which twenty-two volumes have already been 

 issued, while four others are in progress. 



Certainly no group needed more careful and critical 

 revision and examination than the Bryozoa ; and it is hoped 

 that Dr. Gregory will be able to complete the Catalogue 

 of both the earlier and later forms, which at present remain 

 to be worked out in detail. 



HENRY WOODWARD. 



GEOLOGICAL DEPARTMENT, 



BRITISH MUSEUM (NATURAL HISTORY), 

 May, 1896. 



