184 tute: singular cavities in the magnesian limestone. 
yours, and most probably Algse." Mr. Howse also kindly sent me a 
sketch taken from Geinitz' ' Dyas,' with a description of the fossil, 
which Geinitz names " Palaeophycus insignis ;" stem simple, cylin- 
drical, slightly arcuate, with nearly smooth surface, transverse section 
elliptical ; found in the Dolomite Zechstein of Zeimnitz, near Gera,"' 
at a footpath near Ronneburg, and in the Shiefergasse, near Thies- 
chitz. Thus this obscure organism is of very wide occurrence, being 
found in Durham, Yorkshire, and Germany. 
In still lower beds, near Tanfield, I have found marks and 
cavities associated with the remains of undoubted algae, which bear 
some resemblance to those at Wormald Green, but possess less regular 
distinctness of outhne. 
A MONOGRAPH OF YORKSHIRE CARBONIFEROUS AND PERMIAN POLYZOA. 
PART II. BY GEORGE ROBERT VINE.f 
The study of Palaeozoic Polyzoa seems not to have attracted so 
much attention in this as in other countries, consequently there are 
fewer monographs to which the student can be referred. Excepting 
Phillip's Geology of Yorkshire, and McCoy's Palaeozoic Fossils of 
Ireland, nearly all the literature of the subject is to be found in 
scattered publications, but mostly in local transactions of various 
Geological Societies. In the first part of this monogi-aph I gave a 
full list of British papers, but since that was published 1 have gone 
over most of the foreign memoirs and papers, all of which will be 
referred to again when my foreign bibliograph}^ is more complete, but 
I cannot withhold references to two or three American works which 
are not easily accessible to British students out of London. In the 
now celebrated volumes of the Geology and Palaeontology of New 
York, vols. I. to VI., a large series of Polyzoa (Bryozoa of authors) 
from Palaeozoic rocks are described and figured. These, to say the 
least of them, are treated of in a masterly way, by a masterly hand, 
and the abundance of material and State aid to the describer and 
* Gera is near Jena, 
f Part I. Proc. Yorkeh. Geol. and Polyt. Soc , vol. xi , Part I. pp. 68-85. 
