149 
FOSSIL POLYZOA : FURTHER ADDITIONS TO THE CRETACEOUS LISTS. 
BY GEORGE ROBERT YINE. 
When, years ago, I began the study of the Fossil Polyzoa of the 
British rocks, and commence 1 the serial descriptions published in the 
Proceedings of this Society, really good collections were almost un- 
known to science. Lists of species derived from different horizons 
were also difficult to get at. .McCoy in his various Pakeontological 
works ; Professor Phillips' in the Geology of Yorkshire (Carbon- 
iferous part), and also in his '•'Devonian Fossils"; described and 
illustrated species derived from Carboniferous and Devonian Rocks. 
Lonsdale, in Murchisson's Siluria, added considerably to our 
knowledge of forms found in the still lower rocks ; then, in 1854, 
Professor Morris catalogued all the species known to science found 
in British Palaeozoic Rocks, and his lists were constantly referred 
to whenever new additions had to be made. Since then, but still 
within the limits of 20 years, very great additions have been made to 
Palaeozoic lists by the Messrs. Young, of Glasgow, by Mr. Robert 
Etheridge, jun , and by myself. The Permian Polyzoa, however, had 
been ably dealt with by Professor King in his Monograph of Permian 
fossils, and also by Mr. Kirkby. (Permian of S. Yorkshire, Quart. 
Journ. Geol. Soc, vol. xvii., p. 287). The Polyzoan Fauna of the 
Mesozoic and Tertiary Rocks have also been catalogued by Morris, 
and separate memoirs on the Polyzoa of two horizons have been pub- 
lished, namely, the Bryozoa of the Jurassic Formation, by Jules 
Haime, (1854) in which British examples are mentioned; and the 
Polyzoa of the Crag, (1859) by Mr. George Busk. In Dixon's Geology 
of Sussex, (1850) two plates are devoted to the delineation of Cre- 
taceous " Bryozoa," and elaborate descriptions of the same are given 
by Mr. Lonsdale ; and a few Cretaceous forms are briefly described 
and illustrated in Dr. Mantell's Medals of Creation (1845). 
Since the publication of Morris' Catalogue of British Fossils, 
however, great advances have been made in the study of this group 
of organic forms, so much so that what might well have been 
characterised, ten or twelve years ago, as a difficult group to handle, 
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