Dr. H. Woodward—A. Fossil in a Chalk Flint. 483 
distinguished from it and still more easily distinguished from Reuss’ 
original figure.! 
MeEMBRANIPORELLA PUSTULOSA, Nov. Pl. XXXVI, Fig. 9 
Zoarvum unilaminate, adherent. 
Zoecia long and slender, average length ‘7-8 mm. mes ‘3-4 mm. 
the aperture is enclosed by a raised ring which is either truly cir aa 
or slightly broader than long, and merges in the upper part with the 
oceclum, much as in MZ. castrum; the side walls are thin, exsert, and 
quite separate from those of the adjoining zocecia; the front walls are 
formed by a broad backbone united to the side walls by about seven 
ribs springing from the inside of the side walls and with well-marked 
and sometimes considerable spaces between them. 
Oecia globose, without external aperture, and cutting into the front 
wall of the succeeding zocecium ; they are almost invariably present. 
Avicularia mandibular, thin-walled, small but wide; in normal 
zocecia there is always one on either side of the aperture with the 
beak pointing downwards, and others occur irregularly along the 
side walls. 
Occurs in all zones from that of JL. cor-anguinum to that of 
B. mucronata. 
This species is closely related to Cellepora galeata, Hag.,* in which 
species, however, the apertural ring is distinctly longer than broad, 
the spaces between the ribs are very short and do not reach the side 
walls, there is only a very slight swelling to suggest an ocecium, and 
the side walls are broad and common. 
EXPLANATION OF PLATE XXXVI. 
(All figures x 12 diams.) 
Steginopora denticulata. Gravesend. 
Ditto. Broadstairs. 
Ditto. Gravesend (another specimen). 
Steginopora Gravensis. Gravesend. 
Ditto. Gravesend (another specimen). 
Membraniporella fallax. Gravesend. 
Ditto. Gravesend (another specimen). 
Ditto. West Tisted, Hants. A dwarfed form. 
Membraniporella pustulosa. Gravesend. 
CONIA Ar WOW 
’ T].—A Fragment or a Fosstt 1x a Cuatx Frint PEBBLE FROM THE 
SuerrineHamM Bracu, Norrork. 
By Hunry Woopwarp, LL.D., F.R.S. 
fW\HE difficulties which the paleontologist encounters in attempting 
the interpretation of fossil organic remains are numerous, 
especially when compared with the task of the zoologist in the 
study of recent forms. Im a fossil, for instance, the soft parts of the 
animal are wanting, while the anil or exoskeleton is often remarkably 
1 Das Elbthalgebirge in Sachsen, pt. ii, p. 129, pl. xxiv, fig. 16. 
2 In Geinitz, Grundriss d. Versteinerungshunde, p- 613, pl. xxild, fig. 34. 
