vine: YORKSHIRE CARBONIFEROUS AND PERMIAN POLYZOA. 193 
resembles some of the examples of our Britisli Archccopora nexiles, 
De Kon. '^ Indeed I have stem-like examples from Braukamhall before 
me that would answer very well for the definition of >S'. Hertzeri, in 
Mr. Ulrich's text, but the general run of the examples of A. nexiles 
in the Yorkshire shales are either encrusting on the flat, or enveloping 
fragments of spines or other foreign bodies. At present, however, 
I am not in a position to say where this species will be ultimately 
placed in our Zoological arrangements. 
Family RHABDOMESONTiDiE, Vine. 
1883. Rhabdomesontidae, Vine, 4th Brit. Assoc. Rep. Foss. Polyzoa, 
p. 45 of Report. 
1883- 4. „ „ Proc. Yorks. Geol. Soc, vol. viii., 
p. 105. 
1884- 5. „ „ Yorksh. " Naturalist," p. 66, 1884, 
p. 317, 1885. 
1885. „ „ Proc. Yorks. Geol. Soc, vol. ix., p. 21. 
1887. „ Polyz. Gayton Boring Jour. Nor- 
thampton Soc. Nat. History. 
1884. Rhabdomesontidaj, Vine, (Ulrich), Jour. Cincin. Soc. Nat. 
Hist, vol. vii., p. 24. . 
Zoarium rod-like, branching. Zooecia opening on all sides of 
the branch, tubular, attached by their proximal extremities to a 
central rod. Orifice of cells obscured by vestibule : wall of vestibule 
externally ornamented by spines or not. 
Section A. Zooecia attached to a central rod. 
Section B. Zooecia radiating in all directions from an imaginary 
axis. 
In my fourth British Association Report on Fossil Polyzoa, I 
suggested the family name Rhabdomesontidae for the inclusion of two 
remarkable fossils, which were known to Palseontologists from Phillips' 
descriptions, under the names of Millepora and Ceriopora. These 
species, with better examples than Phillips possessed, were re-worked 
by the Messrs. Young, of Glasgow, who discovered that one species at 
* Vine: let Brit. Assoc. Report, pp. 8-9 of Report. This is the only place 
where the species, which is very abundant in the Scotch shales, has been described. 
