Be 
G. R. Vine—Carboniferous Polyzoa. oll 
Paleeozoic Polyzoa, many, at present, very doubtful points must be 
cleared up by a more complete study of all the species of the Palzo- 
zoic and Mesozoic ages of our earth’s history. It is a difficult matter 
with present classifications to place the genera of Palseozoic Polyzoa 
without doing violence to constructed definitions. In the absence, 
- therefore, of any well-defined families in which the Carboniferous 
Polyzoa can be placed, I venture to group the whole of the forms 
under separate headings, which must be considered as provisional 
only. But to prevent any misconception as to the special characters 
of each group, I shall refer to the shape of the cell or zooecia 
especially, as the basis of my arrangement, allowing all the other 
characters to fall into their places as subordinate only. 
Fam. I.— Frneste.iip”. 
Primary Char.—Polyzoary forming small or large fenestrated or 
non-fenestrated expansions. Cells placed biserially, or alternate, so 
as to form branches or “ interstices,” similar in many respects to the 
genus Scrupoceliaria among living Polyzoa: cells bladder-like, 
margin of mouth raised and covered? by “ operculum ” during the 
life of the animal. The nearest living representative cell among the 
British Polyzoa figured by Hincks! is that of Alcyonidium albidum, 
with which I can compare generally the cells of the Fenestellide. 
The following genera are grouped provisionally, many details having 
yet to be worked out :— 
Genus I. Fenrsteria—plebeia, polyporata, membranacea, in which the cells are 
biserially placed. 
», LI. Feneste,iina—xodulosa, actinostoma, in which the cells are alternate, 
literally forming single rows. 
», III. GuavconomE—Only some of the species studied. 
Fam. IJ.—Potyporip2. 
Primary Char.—Polyzoary forming small and large fenestrated 
expansions. Branches robust, cells placed contiguously in aslanting 
direction over the branch, opening on one side only; the cells on 
the margins of the branches (younger cells) nearly of the same 
shape as in the Fenestellide; the older cells in the innermost portion 
of the branches much compressed, but never partaking of a tubular 
character. 
Genus IV. Potypora. 
The cell-structure of the following genera is such as to warrant 
their separation from the whole of the above genera, but they are 
not sufficiently studied, neither are their details so well worked out 
as to enable me to suggest a proper place for them at present. 
Genus I. Goniocladia, Etheridge, jun. 
» LIL. Synoeladia, ae . 
Synocladia, Young and Young. 
», Il. Hyphasmapora, Etheridge, jun. 
», LV. Thamniscus, Young and Young. 
fs V. Sulcoretepora Robertsoni, Young and Young. 
» VI. Archeopora, De Koninck. 
All the above are types of distinct genera, and before they can be 
Two most distinct 
species. 
1 Brit. Marine Polyzoa, 1880, p. 500; vol. i. p, lxx; vol. ii. figs. 8 to 10. 
