88 
VINl-:: NOTES ON YOREDALE POLYZOA. 
Cheilostomata ;* Zooecia five, tubercles five or even raore to eacli 
fenestrule ; iiiterv^als between the cells, and reverse of branches also' 
delicately g-ranular or pimpled. 
Mr. Young (op. cit. Geol. Mag.) says, after quoting- Front's 
description — " To what Prout states one or two additions require to 
be made. The thin lips of the pores in well preserved specimens are 
not circular, but sinks down on the lower edge of the aperture, which 
thus has a pyriform crater shape. In addition to the ridges 
mentioned b}^ Prout ( the ridges do not exist in American examples 
before me), the intervening surface is covered with very fine short 
w-rinkles, which are sinuous and sometimes interrupted, so as to give 
a tubercular aspect." If we add to this that eisrbt cells occupy the 
space of three millemeters, all identity is destro3^ed between the 
Scotch and American Carboniferous Poh/pora tuherculata^ and I am 
compelled, therefore, to accept M'Coy's name for the Yoredale, 
rather than that given to the Scotch forms. 
20 POLYPORA VERRUCOSA ? M'Coy. (Provisional). PI. X., fig. 5. 
= Polypora tuhercuhita, Vine, Proc. Geol. Soc, Yorks., Vol. VII., 
1881, pp. 336-337, pi. XVI., fig. 5. 
= Polypora tuhercuhita (pars) Vine, Brit. Assoc. Rep., Foss. Pol3'zoa. 
Under present circumstances it will be best to place the 
Yoredale species here, and I shall not attempt to describe the 
fragments otherwise than by brief notes. Though rather abundant 
in some localities I have not a specimen larger than about half-inch 
square, so that I am not able to give any dimensions as to size. 
The Zoarium is fenestrated irregularly, similar to Scotch forms. 
Zooecial apertures circular, with intervening spaces between filled in 
with wavy striae ; marginal cells only shghtly iodenting the edge 
but not so prominent as in Scotch forms. Tubercles present, but 
only occasiouallj'' conspicuous. In one well preserved fragment, 
plate X., fig. 5, which appears to me to belong to this species, 
there is, however, a prominent (though delicate) undulating keel 
running down the central part of the branch, upon which the 
tubercles are placed, one to every two cell, but by no means so 
robust as the Sc. itch examples. 
* There is no comp ii-iSoii between tbe two. 
