414 Mr. H. J. Carter on Calcareous Hexactinellid 
diameter. No.2. Pyriform, stipitate, smooth, with circular con- 
centric lines of growth, slightly compressed, 3 inches long ; free 
or large end convex, 3 x 2 inches in diameter, with a funnel- 
shaped excavation in the centre 3 inch wide; the stem broken 
off 3 inches from the summit, and 7-8ths x 6-8ths of an inch in 
itsdiametersat thefracture. No.3. Much the same, but extended 
into a cylindrical form 1 foot long, and the stem broken off as 
inno. Z No.4. Much the same, but the cylindrical portion 
deeply and irregularly constricted at varying intervals, so as 
to present a dozen segments; ending above in being divided 
into a few thick conical processes, but too imperfect to state 
how many, or whether there was any excavation in the centre 
as in nos. 2 and 3; covered throughout with cup-like raised 
cells 1-24th inch in diameter, and about 1-8th inch apart, more 
or less; uppermost segment 4 x 2 inches; deepest constriction, 
which is just where the pyriform passes into the segmented 
cylindrical one, 24 inches in diameter ; total length to the end 
of the stem, which is broken off, 15 inches, diameter of frac- 
tured end of stem 1 inch. No. 5. Agaricoid or tabular; head or 
tabular part presenting concentric lines of growth on both 
sides, with holes 1-24th inch in diameter, in juxtaposition 
on the upper surface, like Favosites ; below, crooked lines of 
elongated cells radiating from the stem to the circumference, 
where they become more or less vertical to form the margin 
of the head; tabular portion 43 inches in horizontal and 
4-8ths inch in vertical diameter; stem round, expanding into 
the head, 4} inch in diameter at the fracture. No. 6. Vasiform 
complete or incomplete, 4 inches across the brim; wall 2 inch 
thick ; prolonged conical apertures 1-8th inch in diameter at 
the base, and 1-24th inch at the aperture, sparsely scattered 
over the inner surface, about + inch apart, more or less, the 
same on the outer side, but smaller in every way and more 
closely approximated than those on the upper surface ; margin 
round and without cells; stem broken off, about + inch in 
diameter at the fracture. There are several specimens of 
nos. 5 and 6, all of which differ considerably in their general 
measurements; that is, some are much larger than others. 
Now I am not going into the description of these fossils 
further than I have done, as this would entail more time than 
I can afford to spare from the study of the Spongida; but I 
cannot help thus briefly noticing their characters respectively, 
in order to introduce their nature under a more interesting 
and satisfactory form, I think, than appears to me to have 
yet been accorded to them. 
Of their belonging to the genus Scyphia, Schweigger, = 
Spongites, Goldfuss, I think there can be no doubt; and I 
have at least identified no. 3 with fig. 12, a, b, tab. iti. in 
