PREFACE. 
The publication of the second volume of the Catalogue 
of Cretaceous Br}’ozoa has been delayed by the Author’s 
retirement from the staff of the British Museum, and his 
consequent occupation with other work. When Dr. Gregory 
left England in 1900 he had already completed part of 
the MS., with some of the illustrations ; but it was not 
until 1905, after his return to this country, that he was 
able at intervals to devote some time to its continuation. 
^Meanwhile, the collections of the Museum had so much 
increased, and additions to our knowledge of the subject 
had been so considerable, that a second volume proved 
inadequate to complete the Catalogue. Dr. Gregory there- 
fore confined himself to an examination of the rest of the 
Cyclostomata, the few Trepostomata, and the single known 
extinct species of Phylactolsemata, leaving the Cheilo- 
stomata to form the subject of a concluding volume. It is 
hoped that this final part of the Catalogue will shortly be 
prepared by Mr. W. D. Lang, who succeeded Dr. Gregory 
as Assistant in special charge of the fossil Bryozoa. 
A. SMITH WOODWAED. 
Department of Geology, 
British Museum (Natural History). 
April 28, 1909. 
