VINE : NEW OR BUT LITTLE KNOWN EOCENE POLYZOA. 61 
The present variety, however, differs from the whole of the 
examples referred to in having the lamina perforated, but in the only 
fragment known to me I have not seen any avicularia. 
3. Microporella violacea Johnston, var. (a) fissa, Waters. 
„ fissa, Hincks. Contrib. Gen. Hist. Marine Poly., Ann. 
Mag. Nat. Hist., ser. v., vol. iv., p. 381. 
,, violacea, var. fissa, "Waters. Quart. Journ. Geol. Soc., 
vol. xxxvii., p. 329, pi. 15, fig. 26 ; pi. 17, fig. 73. 
„ violacea, var. fissa, Vine. Proc. Yorksh. Geol. and 
Polyt. Soc, vol. p. 162. 
The examples of this species are similar to those already des- 
cribed in my first paper. 
Horizon : Bracklesham Beds ; London Clay, Fareham, Hamp- 
shire. 
4. Porella concinna? Busk. Hincks Brit. Marine Poly., vol. i., 
p. 323, pL 46. 
var. Eocena ; var. new. 
Zoarium encrusting, in irregular patches, the whole of a Turri- 
tella sulcifera. Zooecia ovate, convex and punctured round the 
margins, but this feature is often obscured by an incrustation of 
pyrites. Ocecia globose and prominent. 
Horizon : London Clay, Fareham. 
The range of variation in recent P. concinna is so great that 
one naturally hesitates to increase the difficulties of the Palaeontolo- 
gist by suggesting new varietal terms. The Eocene form differs from 
all the figures given by Hincks (Brit. Marine Polyzoa, vol. ii., pi. 46). 
In a modified sense it comes nearest to fig. 11 of the same plate, 
excepting that the general character of the cell is rather less elongate 
or more like the bottom cell in the left-hand corner of the figure, and 
the small avicularian cell is only seen in the better preserved cells. 
I should like to leave the Eocene form here provisionally, trusting 
that better examples, less pyritised, may turn up in the future. 
