100 NOTE ON GLAUCONOME DISTICHA. 
z. That the Devonian and Carboniferous Glauconome will 
form a new genus, for which the name Pinnatopora 
is suggested ; 
3. That the genus Pinnatopora will also include the 
species from the Bala beds, hitherto referred to 
Glauconome. 
The new genus to include the discarded Glauconome will be 
as follows— 
PINNATOPORA. Nov. Gen. 
GLAUCONOME (pars,) McCoy, Brit. Pal. Fos. p. 49. 
Zoarium made up of a series of main stems, having a common 
attachment, with secondary and tertiary branches, given off at 
an acute angle. The tertiary branch may or may not unite with 
a corresponding branch on the adjoining stem. Zocecia cylin- 
drical, arranged in longitudinal and alternate series over one 
half of the surface. Between the row of cells a dividing keel. 
PINNATOPORA SEDGWICKII. Shrubsole. 
Glauconome disticha (pars.) Lonsdale, Brit. Pal. Fos. p. 49. 
Ramipora FHochstetteri, var. carinata, R. Etu., Jun., 
Geol. Mag. 1879, p. 241. 
Sp. char.—Zoarium a series of main, non-bifurcating stems 
growing from a common base, having alternate, secondary, 
and tertiary branches, the latter uniting with a corresponding 
branch on the adjoining stem, so as to connect the entire 
zoarium. Zocecia long, tubular, aperture circular, arranged 
longitudinally in alternate rows spread over one-half of the 
surface. A dividing keel between the rows of cells. Reverse 
angular. 
Obs.—The chief interest of this species is that it is the oldest 
known representative of its class. It is the head of an import- 
ant genus ranging from the Bala or Caradoc beds to the latest 
Carboniferous. Although the earliest of its kind, this species 
was of strong robust growth, exceeding in size the species of 
later date. Large fragments of it are frequently found in the 
Bala beds, far less broken than any of the Carboniferous 
species. That so fragile an organism should be found in an 
almost unbroken condition suggests the explanation that the 
sediment, from whatever cause, must have accumulated very 
rapidly around it. 
An excellent drawing of it will be found in the Geological 
Magazine, for June, 1879, 
Locality.—Fairly abundant in the Bala beds of Glyn Ceiriog, 
Denbighshire, and Bwlch-y-gaseg and Cerig Coedog, South of 
Corwen, and Bryntirion, West of Corwen. 
