206 REPORT—1883. 
In this family, Mr. Ulrich places two genera, one of which he calls 
Arthronema, Ulrich, which from the figures and description appears to be 
a true Polyzoon. The other genus is Arthroclema, Billings. In this 
genus the segments are cylindrical, with cell apertures opening on all 
sides. ‘here are species in the Wenlock Shales closely related to, if not 
identical with, the American forms, but I have no evidence of the further 
character given by Mr. Ulrich: ‘ Zoariwm composed of numerous seg- 
ments ... . pointed more or less obtusely at both ends.’ 
There is another species of a genus—Awaanopora, Nickles MS.— 
closely related to Wenlock Shale species; but as Mr. J. M. Nickles has 
not yet published details of the type, I am not at liberty to refer to it 
more pointedly at present. The type of the genus is Chwtetes minuta, 
James, No. 266 of Mr. Ulrich’s ‘Catalogue. (‘Cat. of Foss. occurring 
in the Cincinnati Group of Indiana and Kentucky,’ E. O. Ulrich, 1880.) 
There are still several other fossils that would form a group here by 
themselves, for the whole of the Ceriopora of the Silurian Rocks may be 
conveniently reworked. 
Family Crramoporipa, Ulrich. 
This is another of the families of Mr. Ulrich in which some of our 
Silurian and Carboniferous forms may ultimately be placed. They are 
not, however, in the strict sense of the term, Polyzoa. 
Genus Ceramopora, Hall. Genus Crepipora, Ulrich. 
»,  Ceramoporella, Ulrich. ». Lridopora — ,, 
»  Cheiloporella ah 
Part IV. 
BIBLIOGRAPHY. 
Breri0GraPuy of Paleeozoic and Mesozoic Polyzoa published in Great 
Britain, in various periodicals, since the publication of Professor Morris’s 
“Catalogue of British Fossils,’ 1854. 
E. W. CLAYPOLE, B.A., F.G.S. 
1883. On Helicopora latispiralis. A new Spiral Fenestellid from the Upp. Sil. 
3eds of Ohio, ‘ Quart. Jour. Geo. Soc.’ May 1883. 
Prof. P. M. DUNCAN and Mr. H. M. JENKINS. 
1869. On Pal@ocoryne, from the Carb. Formation, ‘ Phil. Trans.’ clix. p. 6938. 
1873. On the Genus Paleocoryne and its Affinities, ‘Quart. Jour. Geo. Soc.’ xxix, 
p. 412. 
1874. Remarks on Messrs. Young’s paper on Pal@ocoryne, Quart. Jour. Geo. Soc.’ 
Xxx. p. 684. 
ROBERT ETHERIDGE, F.R.S. 
1881. Anniversary Address. Analysis and Distribution of Brit. Palzozoic Fossils 
(Polyzoa), ‘ Quart. Jour. Geo. Soc.’ Feb. 1881. 
1882. Second Presidential Address. Analysis and Distribution of Brit, Jurassic 
Fossils (Polyzoa), ‘ Quart. Jour. Geo. Soc.’ May 1882. 
' ROBERT ETHERIDGE, jun., F.G.S. 
1873. Explanation of Sheet 23 Geo. Survey, Scotland. In the descriptive Palazon- 
tology of this sheet Mr. Robert Etheridge, jun., gives descriptions of 
New Carboniferous Polyzoa, Cwrinella cellulifera, Fenestella bicellulata, 
EF. tuberculo-carinata, Polypora (Thamniscus) sp., Synocladia biserialis, 
