VINE: CARBONIFEKOUS POLYZOA. 
169 
1st. — The root-like base of the present species is, so far as I can see, 
unique. 2nd. — The strong rounded central keel with its spiuiferous 
row is also different, in P. PhiWpsi there is no prominent keel, 
the two rows of cells are in one plane, and whenever these are 
exposed, the bases of the cells are contiguous as in Glauconome species^ 
I have purposely kept the two distinct, but the possession of better 
material may cause me to alter my opinion in the future. Under 
present circumstances it is impossible to do so. 
Genus Polypora, McCoy. 
7. Polypora laxa, Phill, Geol York., Vol. I., pi, L, figs. 26-30. (Retepora 
laxa, pars.) 
~ Fentstella laxa, Phill. Palseoz., Foss. of Devon, Cornwall, &c. 
~ Polypora laxa, Morris, Cat. Brit. Foss. 
" An irregular open network, interstices round, bearing on the 
reverse, oval spaces in quincunx, and interjacent lines of very minute 
pores. It resembles Gorgonia rijnsteria Goldfuss." Such is Phillips' 
original description of Retepora laxa of Whitewell ; but the descrip- 
tion is far more applicable to the Derbyshire, than to the Yorkshire 
specimen. In the Paheozoic fossils of Devon, &c., Phillips referred a 
similar fossil to his Yorkshire species. In his Geology of Yorkshire, 
Phillips seems to have given figures of two different species, but I 
cannot make out distinctly what they are. I cannot believe that 
Phillips was entirely ignorant of the Derbyshire specimens, for his 
larger figures closely resembles that which is before me. I shall 
therefore describe the Derbyshire species as the nearest to the 
original of Phillips. 
Zoarium, an open network with a very irregular habit. Root 
like base thick and prominent. Branches, round, rather more robust 
in its early, than in its later stages ; bearing three rows of cells on 
the face, reverse striated. Fenestrules, large and irregular, from 
two to three, in two lines, measured transversely, dissepiments thin. 
Localities : Survived from Devonian, Phillips ; Carboniferous, 
Whitewell ; Kildare, Ireland ; Derbyshire, Castleton ; Settle, York- 
shire ; Richmond, Yorkshire. 
8. Polypora tuberculata? 
In the general aspect, specimens of the Zoarium of this species, 
closely resemble the Scotch PolyiJora tuberculata Prout, and I am 
