76 
list one of the largest fossil Criuoids known, Ctjathocrinus Konincki, Clarke, 
to redescribe Trihrachiocrinns Clarkei, McCoy, and to indicate the probable 
presence of otlier genera from their fragmentary remains. 
In 1884 the list was increased by the late Mr. Pelix Eatte describing 
a second species of Trihrachiocrinns \ ^ and lastly, by Messrs. Waclismutli and 
Springer, in their most comprehensive “ Eevision of the Palaeocrinoidea,” 
defining^ Trihrachiocrinns according to the more recently accej^ted nomen- 
clature, and relegating it to its proper place in the classificatory scale. 
The abundance of Crinoid skeletal remains has already been 
referred to, particularly stem joints, and portions of the united column ; in 
some cases, as in the Carboniferous Limestone of other parts of the world, 
forming the great mass of entire beds. Such deposits have been found by 
the Collector near Ulladulla ; at the head of Flat-rock Creek, Nowra Ilill ; 
Eouchel Brook, about six miles from the Hunter Elver Junction, and other 
places. 
At Flat-rock Creek the portions of stems obtained are fairly large, 
and resemble those of Toteriocrinns crassns, of the Eurojieau Carboniferous 
Limestone. 
The chief horizons from whence determinable Crinoids have been 
ol)tained are the Murce Ptock, of the Upper Marine Group in the Hunter 
Valley, and its southern equivalent, the Conjola Grits of the Shoalhaven 
District, and a few localities in the more strictly Carboniferous area north 
of the Eiver Hunter. 
One very strong fact, however, stands prominently forward, that so 
far as our field operations have as yet disclosed, the genera Trihrachiocrinns 
and Thialocrinns are not known out of the Permo-Carboniferous, and are 
particularly characteristic of the Upper Marine Series. 
'Proc. Linn. Soc. N. S. Wales for 1884 [1885], IX, Pt. 4, p. 1158. 
'^Ilevisioii of the Pala-ocrinoiclea, 1886, Pt. Ill (2), p. 251 (175). 
