he ee 
Paleozoic Corals and Foraminifera. 1] 
of closely superposed conical plates, connected by a few fine 
vertical lamella : lamelliferous zone surrounding the axis nar- 
row, of about forty-two alternately broad and rudimentary 
lamelle, the interstitial plates of which are nearly horizontal : 
outer zone wide, formed of large arched plates, not highly in- 
clined, and forming a loosely vesicular structure : terminal star, 
axis very prominent, oval, vertically ribbed, but not twisted, 
seated in a deep oval or circular cup, lined by the strong ra- 
diating lamelle ; outer zone nearly flat, oblique at the sides, 
faintly marked with rather distant, fine lines, representing the 
strong radiating lamelle of the mner zone, continued to the 
boundaries of the cells, which are strong, prominent and 
shghtly crenulated. 
A vertical section shows first, the outer largely vesicular area 
formed of broad, curved, slightly inclined plates ; between this 
and the inner area there is a fine vertical defining line, within 
which the plates of the inner zone are seen to be finer and closer 
than those of the outer, forming a smaller cellular structure ; the 
rows of cells are nearly horizontal near the outer zone, but within 
seem gradually to bend up and become continuous with the co- 
nical cup-like plates forming the axis ; those conical plates of the 
axis seem connected by extremely delicate, irregular, radiating 
plates ; in a rough transverse section the axis appears as a deep 
conical hollow on the under side. It will thus be seen that in the 
remarkable cone-in-cone structure of the axis this resembles the 
Russian Strombodes mammillare and S. astroides (Lithostrotion id. 
of Lonsdale), from both of which it differs in the axis not being 
twisted in the terminal star, in the outer zone not being traversed 
by strong radiating lamelle, from the former in the much less 
obliquity of the plates of the outer area, and from the latter by 
the largely cellular structure of the outer area, as well as the di- 
stinctness of all the three areas under every circumstance. In 
general appearance and imperfect radiation of the outer area it 
resembles the S. emarciatum and S. floriforme (Lithostrotion id. of 
Lonsdale), but is distinguished from the first by the rudimentary 
radiating lamellz between the primary ones, and from both by 
the conical structure of the axis, which is formed in them of 
irregularly twisted vertical plates. 
Not uncommon in the carboniferous limestone near Bakewell, 
Derbyshire. 
(Col. University of Cambridge.) 
Lonsdaleia (M‘Coy), n. g. 
Gen. Char. Corallum composed of circular, tapering, proliferous 
stems, never laterally united ; internally composed of three 
