30 
VINE : CLASSIFICATION OF THE PAL.^IOZOIC POLYZOA. 
long before I wrote, for our generic divisions then Mr. Ulrich is 
right and I am wrong ; but if the cell or Zowcia is to form the basis of 
our suggested divisions, then our work must be left to the convenience 
or the inclinations of future workers. 
Since my labours commenced, the so-called Ceramopora megas- 
toma, M'Coy," has been removed from the Polyzoan group to the 
Coelenterata, and in all probability Ceriopora interporosa, Phillips, will 
have to submit to the same fate. What other species will have to be 
removed I can partially anticipate, but the removal of these at least 
is justifiable on account of their peculiar structural elements.! 
Mr. Ulrich however, still regards these as w^ell as the Monticuliporidse 
generally, as belonging to the Bryozoan group. 
We have, then, three sub-divisions, under which the Palaeozoic 
Polyzoa may be placed, but whether it will be wise to retain the 
w^hole, remains for future workers to decide. My belief is that all 
may be safely retained, but so far as the grouping of the Palaeozoic 
Polyzoa is concerned, a little more latitude must be observed, because 
we deal with more primitive structures than in the grouping of 
Mesozoic, Tertiary, or Recent species. 
I have already, in my Fourth British Association Report on 
Fossil Polyzoa (1883), given the history of the general grouping of 
Fossil species, ranging from the Silurian to the Upper Cretaceous 
Rocks ; and, as already referred to, I have recently reviewed in this 
Journal the Cyclostomata of the Jurassic Rocks, I shall now show the 
tendency of modern systematic classification as regards Palaeozoic 
species. 
In his "Scheme of classification of the iVmerican Palaeozoic 
Bryozoa,"^ Mr. E. 0. Ulrich arranges the Cyclostomatous group as 
follows : — 
Sub Order Cyclostomata, Busk. 
I. Family TuBULiPORiDiE, Busk. 
Genus Stomatopora — Bronn : ranging from the Trenton. 
„ Proboscina, Audouin. 
* Review of the Diastoporidae, Quart. Jour. Geol. Soc, 1880. 
t See a Paper by Nicholson & Foord, Ann. Mag. Nat. Hiet., Ser. V., Vol. XVI, 1885. 
X Journ. Cincin. Soc. Nat. History, Vol. v., 1882, p. 149. 
