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XXVI. On Palaeocoryne, a Genus of Tuhularine Hydrozoa from the Carboniferous 
Formation. By P. Martin Duncan, F.R.S., See. Geol. Soc., and H. M. Jenkins, 
F.G.S., Sec. Royal Agric. Soc. 
Received June 14, — Read June 17, 1869. 
I. Introduction. 
II. Minute anatomy. 
III. Zoological position. 
IY. Terminology. 
Contents. 
Y. Classification. 
YI. Description of the species. 
YII. Remarks. 
YIII. Palaeontological relations. 
I. Introduction. — The lower shales of the Carboniferous limestone series of Ayrshire 
and Lanarkshire are very fossiliferous in many places, and the organic remains found in 
them are remarkable for their perfect condition of preservation. 
There are large numbers of fossil Brachiopoda, Polyzoa, Crinoidea, and Madrepo- 
raria in the black shales of Roughwood and Broadstone, near Beith, and of Auchens- 
keigh, and of Gare, near Carluke. Associated with the Polyzoa are numerous small 
pedunculated radiata, whose external appearance differs from that of any extinct organ- 
ism hitherto discovered. 
They are usually found attached to the margins of the polyzoarium of Fenestellce, 
or they may he discovered in a more or less fragmentary condition amongst the 
small pieces of broken Polyzoa and Crinoid stems which compose the fossiliferous 
layers of the shales. The attachment is by a dactylose base, which, when broken or 
cut, is proved to be cellular internally. The base contracts as it increases in height, 
and is continued upwards in the form of a cylindrical stem, which is faintly enlarged 
in its middle portion, and which is surmounted by a symmetrical structure resembling 
a reversed obtuse cone, the margin of whose base is produced into several tentacular 
processes. 
The tentacular processes are in one whorl ; they radiate from the margin of the upper 
part of the conical body, and they are separate at their point of origin. They are long, 
slender, tapering, and occasionally irregular in their length and thickness. Their 
direction is not at right angles to the stem, but they project obliquely upwards and 
outwards. The inferior surface of the tentacles is continuous with the outside of the 
conical body, and the superior surface is continued on to the upper surface, or reversed 
base, of the conical body, which has a much greater diameter than the supporting stem. 
This upper surface is flat in many specimens, but in a few it is elevated centrally into a 
crateriform process, which has an opening on its apex. 
4 z 
MDOCCLXIX. 
