vine: YORKSHIRE CARBONIFEROUS AND PERMIAN POLYZOA. 199 
1885-6. Rhorabopora similis ? Vine, Proc. Yorks Geol. See, vol. ix., 
p. 24. 
Zoarium rod like, or branching. Zooecia circular or hexagonal. 
Vestibular area well defined, sloping inward, at the bottom of which 
is the Zooecial aperture. The walls surrounding the vestibular area 
are ornamented witli a varying number of blunt spines, which in 
sections are seen to be hollow. 
Locality : Hurst, Yorkshire ; North Lancashire ; the species is 
found in some of the Scotch horizons also, but it seems to have had 
a limited range in British rocks at least. 
In a species of Ehomhopom described by Mr. Ulrich as R. ele- 
gantula, Ul.,"^' similar facial features to the above are noticeable, but 
the branching of the American form is different. 
3. Rhombopora persimilis, Ulrich. 
1884. R. persimihs, Ulrich, Jour. Cincin. Soc. Xat. Hist. p. 30. 
1884. R. persimilis. Vine, Proc. Yorksh. Geol. Soc, vol. viii., p. 106. 
1885-6. R. persimilis, Vine, Ibid, vol. ix., p. 24. 
1887. R. persimilis (var. B.) Vine, Jour, Northampton Soc. Nat. 
History, p. 11. 
The above has been described rather fully in the above papers, 
and the Yorkshire examples especially in the 1884 paper quoted 
from this journal. 
Localities : British forms : Hurst, Yorkshire ; North Lancashire ; 
Gayton Boring, Northampton. American forms: Kaskaskia group. 
Lower Garb. Rocks, Chester, 111. : Tateville, Kg. (L'lrich.) 
Description of Figures. Plate vii. 
1. Hyphasmopora, Buskii, Eth. Jun., with lateral " ovicell," x 30. 
2. „ with " ovicell " in branch, X 30. 
3. „ Section of " ovicell " in the 
angle of branch ; transparent. All from Garb. Shale, Brank- 
emhall, Scotland. My own cabinet. 
4. Hyphasmopora Buskii, Eth. J. Fragment, Hurst, Yorkshire. 
5. Rhabdomeson rhombiferum (Phill. sp.), with "ovicell," x 30. 
Brankemhall, Scotland. 
* Journ. Cincin. Soc. Nat. Hist., April, 1884, p. 33, 
