VINE : CLASSIFICATION OF THE PALAEOZOIC POLYZOA. 
21 
commencement of my British Association Reports on Fossil Polyzoa 
in 1880, new investigators have entered the field, and if the good 
old proverb is true, ' many minds, many modes,' the results will be 
that the varied methods now adopted by Palaeontologists, will ulti- 
mately enable us to look at the PalcTozoic Polyzoa from different 
standpoints, so as to have an allround view of the same, rather than 
from one standpoint only. In my recently published paper, " Notes 
on Classifications of Cyclostomatous Polyzoa, old and new,"'" I have 
done my best to gather together into one focus, much, if not all that 
has been suggested respecting the classification of the Mesozoic 
Polyzoa, and in the present paper I wish to do the same for the 
Polyzoa of the Palaeozoic horizons. In the present case it will be 
wiser to deal with the suggested subdivisions separately, and in order 
of time. 
In his valuable introduction to "American Palaeozoic Bryozoa,"t 
Mr. E. 0. Ulrich has given very elaborate details respecting the 
general structure of the Monticuliporidae, and of ''a great number 
of undoubted Bryozoa belonging to the sub-order Cyclostomata," 
which should be studied carefully by future investigators. Mr. Ulrich 
includes in his Bryozoa group, as do American authors generally, 
the whole of the Monticuliporidae. These, however, are placed 
amongst the corals by English authors, such as Duncan and 
Nicholson. In the not-far-olf future some species at least of the 
Monticuliporidae will have to be retained as Bryozoa, in spite of the 
now general disposition to place them elsewhere, or we shall have to 
modify, considerably, our ideas respecting many of the Polyzoa of 
Mesozoic and Tertiary horizons. In the present paper I have excepted 
the Monticulipora until our British Silurian examples have been more 
carefully studied. 
I. — Cyclostomata Busk. 1857, Published in 1859. 
" Cell tubular : orifice terminal, of same diameter as the cell, 
without any moveable apparatus for its closure, consistence calcare- 
ous." Monograph of the Crag Polyzoa. 
There is not, so far as I am aware, any insuperable difficulty of 
* Proc. Yorks. Geol. & Polyt. Society, Part III, Vol. IX, 1888. 
t Jour. Cine. Soc. Nat. Hist, VoL V., pp. 121-149. 
