510 G. R. Vine—Carboniferous Polyzoa. 
structure is revealed, which for a long time puzzled me, because the 
peculiar biserial cells appeared like an analogous structure referred 
to by Prof. Nicholson when describing Carinopora Hindei, Nich." 
His figures, however, are said to be transverse, mine are longitudi- 
nal, or in a line with the bases of the cells. These tail-like processes 
are constant characters at certain intervals even in a very small 
section, and may help in the recognition of the genus in sections 
of limestone. At first sight Archwopora has the appearance of 
Callopora incrassata, as described and figured by Nicholson,’ but 
a very little examination will show the difference between the two 
forms, whereas one is a Polyzoon and the other a Tabulate coral. _ 
I have now gone over the whole of the recorded genera and species 
of British Carboniferous Polyzoa, with the exception of the Fenestel- 
lidz. These having been so lately and so ably reviewed by Mr. G. 
W. Shrubsole, F.G.S., their omission from this report will not be so 
much felt as the omission of any of the other lesser known forms. 
Mr. Shrubsole, after very elaborate investigations, and after the care- 
ful comparison of nearly all the known so-called species, is inclined 
to restrict the twenty-six species to five typical ones, namely : *— 
Fenestella plebeia, M‘Coy ; Fenestella nodulosa, Phillips. 
“2 crassa a “5 membranacea, ,, Sp. 
»,  polyporata, Phillips. 
all the other “species” falling into the rank of synonyms of one or 
other of the five here received by him. But this does not confine the 
number of known species to five. When his labours on the family 
are completed several new forms will be described, together with at 
least two more species of Polypora—the results of laborious investi- 
gations in North Wales. There are also some references to the 
Polyzoa of the Carboniferous Limestone of the districts between 
Llanymynech and Minerva, N.W., in the lately published work?* of 
G. H. Morton, F.G.8., Hon. Sec. of the Liverpool Geological Society. 
Several other papers on special points, having reference to Polyzoa, 
have been published during the last ten or twelve years. The vexed 
question as to the Hydrozoal or Polyzoal affinities of Paleocoryne has 
been debated by Prof. Duncan,’ Prof. Young, and Mr. John Young,® 
and by myself ;* but the question as to their real affinities is still an 
open one. Another paper by Mr. A. W. Waters,® entitled ‘ Remarks 
on some Fenestellide,”’ contains some debatable matter, and the 
papers of Mr. Robert Etheridge, jun., on the genus Glauconome, 
Messrs. Young on the genus Ceriopora, and the paper on the “ Per- 
fect Condition of the Cell-pores and other points of structure,”® are 
valuable additions to our knowledge of Carboniferous Polyzoa. 
Before any attempt can be made to construct a system of classifica- 
tion which will embrace—naturally —the several genera of the 
Annals and Mag. Nat. Hist., Feb. 1874, p. 81, figs. f and i. 
New Devonian Foss., Gzon. Mac., Vol. I. 1874, p: 2, Plate I. 
“‘ Carboniferous Fenestellide,’? Quart. Journ. Geol. Soc., May, 1879. 
The Carb. Limestone and Cefn-y-fedw Sandstone, London, David Bogue, 1880. 
Phil. Transac., 1869.; Journ. Geol. Soc., 1873 ; Journ. Geol. Soc., Dec. 1874. 
Journ. Geol. Soe. Dec. 1874. 7 Science Gossip, 1879. 
Proc. of Manchester Geol, Soc., 1879. ° Newspaper Report, Oct. 9, 1879. 
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