VINE : POLYZOA OF THE LOWER AND UPPER GREENSAND. 251 
cabinet has been gradually enriched by additions of Cretaceous j 
Polyzoa from foreign horizons, so that now I am better able to appre- 
ciate the labours of Dr. Goldfuss, Hagenow, and D'Orbigny, whose j 
delineations of Cretaceous Bryozoa deserve our highest admiration. ] 
The works of other students, such as Beissel, Reuss, Roemer, and j 
Simonowitsch have also increased my knowledge of the varied forms j 
of the wide-spread Polyzoa of the Cretaceous epoch. Since 1885, too, j 
other students have been at work on this beautiful group, notably J 
among the rest Dr. Pergens of Belgium, wlio, having had access to j 
D'Orbigny's original collection, will be able to clear up many difficult : 
problems respecting the minuter work, structural features, &c., of ! 
D'Orbigny. Besides this Dr. Pergens has been actively engaged on j 
the correlation and distribution of Cretaceous Bryozoa in the 'Tufeau i 
de Maestricht," "Limstende Faxe," "Cretace de la Scanie," and j 
the " Cretace de la Saxe et de la Boheme,"" and by the aid of these I 
published lists the pahcontologist is now better able to study the j 
ranges of the commoner forms of Cretaceous Polyzoa ; but, because ] 
there was no more recent list than that of Morris, British Lower Cre- j 
taceous species have been, heretofore, only faintly dealt with. For i 
the purpose of this and another paper, I have recently re-examined | 
the collection of Upper and Lower Greensand Polyzoa in the School ' 
of Mines. Nearly the whole of these are named in the cretaceous ! 
catalogue of that Institution (1878), but in the synoptical table j 
which will precede the descriptive matter I have endeavoured to re- ! 
arrange the species, as far as I am able, in accord with the Hincksian \ 
classification. This the student of Fossil Polyzoa wdll be ready to j 
acknowledge is not always possible, for the simple reason that, though | 
the arrangement of the Cheilostomata is to a large extent impregnable, 
the arrangement of the Cyclostomata has *to be modified, enlarged or ; 
restricted, according to the age and the horizon of the fossils dealt \ 
with. Hence in re-arranging the generic names in the published : 
lists of Morris, and the School of Mines Catalogue, I have made j 
reference to the text and figures of D'Orbigny before doing so. In j 
some few instances I have retained D'Orbigny's generic terms for ' 
special groups. I 
* Sur I'age de la partie s-iperieuse du "Tuffeau de Coply." Brussels, 1887. i 
