VINE : CARBONIFEROUS POLYZOA. 
165 
Localities : Derbyshire, Castleton ; Yorkshire, Settle. Widely 
distributed, and ranging from Lower Carboniferous to Permian. 
2. Fenestella membranacea, Phillips’ Geol. Yorks., PI. i., Figs. 1 to G. 
= • R. flabellata, Phillips’ Geol. Yorks., PI. i., Fig. 7-10. 
= R. tenuifila ,, „ „ ,, 23-24-25. 
1 have only poor specimens of the type R. flabellata , Phillips ; 
it is a portion of the flat expansion of the upper portion of the 
Zoarium. The branches are rounded straight and in parallel lines ; 
the dissepiments are fine, fenestrules oblong, slightly wfider than the 
branches, and the average number to two lines, are about eight 
transversely, and five longitudinally. The Zosecia are small and 
the orifice circular, from three to four occupy the length of the 
fenestrule. 
Some very interesting particulars are given by Mr. Shrubsole 
respecting the development of this species, and in all probability the 
whole of his synonyms are correct, but I am not able, for want of 
material, to endorse the whole. 
Localities: Derbyshire, Castleton ; (Phillips: Bolland, Harrogate, 
Richmond, Hawes, Whitewell, Middleham). 
3. Fenestella nodulosa (?) Phillips. Geol. Yorks, pi. i., Figs. 31, 32, 33 
= F. Frutex (?) McCoy (§>yn. Garb. Foss. Ireland , pi. xviii., Fig. 10). 
I have a fine specimen of Fenestella and it appears to me to be 
referable to F. nodulosa ; and yet it might have very well served 
as the type of F. hemispherica McCoy. It is hemispherical and cup 
shaped, otherwise it is characteristically F. nodulosa. The Zoarium 
begins as a small base, enlarging’ and expanding by growth till at 
the distal part it is nearly two inches in breadth. The zomcia open 
in the inside of the cup. In this respect it closely resembles the 
flabelliform growth of F. frutex McCoy, a name which Mr. Shrub- 
sole gives as a Syn. of F. nodulosa. Although I have marked the 
species with a note of interrogation I have but little hesitency in 
accepting the character as given in the paper on Carboniferous 
Fenestellida, p. 183. In comparing, however, this with a Scotch 
specimen of F. nodulosa I cannot help remarking on the difference 
in the habit of the two types. The Derbyshire specimen is a deep 
water, and the Scotch a comparatively shallow water form, and in 
the first, the root, branches, and cells are strong and robust, whereof 
