166 
VINE: CAKBONIFEROUS POLYZOA. 
in the latter the whole framework is delicate or slender. Phillips' 
description appears to have been given from a flattened specimen, 
.^oarmm, " Radiating- dissepiments thin, fenestrules arcuato quadrate, 
pores usually one at the middle undulating" the margin, and one at 
each dissepiment," the following* refers to the remains of the spiny 
processes along- the keel, " Smaller pores in the interstices." 
Since this was written I have received from Mr. xVitken another 
frag-ment of F. nodulosa that might have served as the type of Fig'. 
31, pi. I., ( Geol. of Forks. ) It is far more delicate and characteristic 
of the species than the above. With this specimen before me I am 
obliged to say that very few descriptions could be clearer than that 
given by Phillips, as already quoted, but I have no desire to remove 
the (?) from the above description. 
Localities: (Phillips: Whitewell, Greenhow Hill, Harrogate). 
Castleton, Derbyshire ; Settle, Yorkshire. 
4. Fenestella polyporata Phillips, Geol. YorTca. pi. i., Fig. 19, 20. F. 
muUiporata, McCoy, Syn. Garb. Foss. Ireland, pi. xxviii, Fig. 9. 
I have before me several specimens of this species, the largest 
of the British FenestellidBS as regards the size of the fenestrules. 
Mr. Shrubsole who has had the advantage of comparing the type 
specimens of McCoy, or at least specimens from the same locality 
says — It is subject to considerable variation." Prof. McCoy in his 
arrangement of the Fenestella assigned the smaller type to Phillips' 
F. polyporata, and the type with the larger development and greater 
number of pores he described as F. muUiporata, but as both conform 
so well to the type in other respects, there is no reason for the 
division (Op. cit. p. 186.) 
Zoarium foliaceous branches large and rounded, fenestrules 
large and elongated, four in the space of a line measured transversely, 
and two in the same space if measured longitudinally, keel rounded 
and well developed. Zocecia from five to nine in the length of the 
fenestrule, openings small, occasionally prominent. Dissepiments, 
thin and placed at irregular distances. 
Localities: The only locality given by Phillips is Florence 
Court. Castleton, Derbyshire ; Poolvash, Isle of Man ; (Small frag- 
ments) Settle, Yorkshire. These are the only species of Fenestella 
