INTRODUCTION. 
xlvii 
collected by ^Ir. AY. Gamble ; the first specimens from that locality 
in the Aluseum were presented by him in 1889 ; larger collections 
were obtained later by purchase, and other specimens from 
Chatham were obtained in the Vine Collection. That collection, 
purchased in 1893 from the executors of G. K. A^ine, included 
a valuable series of Chalk specimens, but its most important 
were his types from the Red Chalk and the Cambridge Greensand ; 
these fossils are often very fragmentary and poorly preserved, 
and the interpretation of most of the species would be impossible 
without access to the original specimens. Other Chalk material 
has been presented by Dr. H. P. Blackmore, of Salisbury, 
Dr. AA"'. F. Hume, and Air. Joseph AYright, of Belfast, from whom 
the Aluseum received a small series of Bryozoa from the Irish 
Chalk. 
The Bryozoa of the Red Chalk and of the Cambridge Greensand 
are well represented in the collection of T. Jesson. Those of 
the Farringdou sponge gravels, with which the collection is poorly 
provided, were mainly obtained in the Cunnington, Afantell, and 
S. Sharp Collections. An interesting but imperfectly preserved 
collection from the Tipper Greensand of the Haldon Hills was 
bequeathed by AYilliam Ahcary in 1903. 
The most important collection of Foreign Cretaceous Bryozoa 
is the large A^an Breda Collection from the limestones of Maastricht; 
further material from the same locality has been acquired with the 
Ahne Collection, many specimens of which were identified by 
Air. Pergens, and others are in the Busk Collection. 
During recent years small representative collections from many 
important foreign localities have been acquired by purchase and 
exchange. 
Thus the important fauna from the German Heocomian is repre- 
sented by a collection purchased from Krantz in 1898 ; others were 
presented by Professor Credner the same year. A collection of the 
Senonian Bryozoa from the Loire Valley was bought from Mr. F. H. 
Butler in 1898. Specimens from Hew Jersey were obtained by 
purchase from Air. Ulrich in 1898-9. From the Chalk of Riigen 
a vast collection has been obtained from Mrs. Agnes Laur, of 
Dresden, by successive purchases in 1899 and later years, but of 
this series only part of the first collection has been incorporated 
in the Catalogue. 
