75 
referred to. In P. giganteus the corresponding plates of the body, it is true, 
are hid by spine impressions, but there is, practically speaking, no room for 
similarly large structures, and on this ground their absence is conjectured. 
The oral plates are certainly very large, and quite different from the 
small node-like bones in P. Stutchhurii. In all probability the adambnlacral 
j)lates will be found to be smaller than those of the last-named fossil, but to 
possess larger and better developed tubercles. In fact, the latter have much 
the appearance of the primary tubercles of ArchceoGidarm. 
As regards the extent of the body, P. giganteus is even a larger 
species than P. Clarkei, measuring no less than seven inches from the apex 
of one ray to that of another across the disc. 
Locality and Horizon. — Ravensfield Quarry, near Parley, Co. Northum- 
berland (Mr. T. BroioneJ : — Lower Marine Series. 
Division — PELMATOZOA. 
C/rm— CRINOIDEA. 
Ohs. — The first Writer to chronicle the remains of this Class in the 
Permo-Carboniferous rocks of New South Wales was Sir E. McCoy,^ who 
brought to notice the interesting, and apparently aberrant Tribrachiocrinus, 
Clarkei. Later, the j)resence of the United States Exploring Expedition, 
under the orders of Commander Charles Wilkes, U.S.N., afforded Prof. J. D. 
Dana, Naturalist to the Expedition, the opportunity of examining some 
portions of the coast districts of New South Wales, resulting in the discovery 
of some very strange plates, to which he aj)plied the generic name of 
JPentadia.^ These will be referred to in detail later on. 
As the original collection of the late Eev. W. B. Clarke, E.B.S., 
afforded Prof. McCoy the first introduction to our Permo-Carboniferous 
Crinoids, so the second, accumulated l)y the same energetic Geologist, enabled 
the late Prof. L. G. de Koninck to advance our knowledge^ by adding to the 
'Ann. Mag. Nat. Hist., 1847, XX, p. 228. 
2 Wilkes’ U. S. Explor. Exped., 1849, X (Geology), p. 712. 
^Foss. Pal. Nouv.-Galles du Sud, Pt. 3, 1877, pp. 158-166. 
