PREFACE. 
In the earlier work on the “Jurassic Bryozoa’’ (May, 1896), 
the Author gave a valuable Introduction upon the structure 
and affinities of the group. , 
The present volume was intended to embrace the whole 
of the Cretaceous Bryozoa, but the extent of the collection 
to be catalogued was not fully estimated, and it is found 
that there are ample materials for two volumes. Much 
labour has been entailed by Dr. Gregory in the task which 
he has undertaken, and great credit is due to him for 
having completed the first half of the Catalogue. This 
enables the present work to be brought out at once, with 
its full complement of illustrations, and it is hoped that 
the second volume may be issued in the new year. 
HENRY WOODWARD. 
Geological Department, 
British Museum (Natural History). 
November 20, 1899. 
