10 
III -DESCRIPTION OF THE GENERA AND SPECIES. 
CIIINOIDEA. 
ISOCRINUS, Vo7i Meyer, 1837.' 
(Mus. Seukenberg, 1837, p. 251.) 
ISOCRINUS AUSTRALIS, MOOVS, Sp. 
(PI. IV, Vigs. 7-10.) 
Pentttcrinvs (lustralis, Moore, Quart. Journ. Gcol. Soc., 1870, XXVI, p. 243, t. 17, f. 3. 
t. 18, f. 1. 
Ventacr'mus australis, Eth. fil.. Cat. Austr. Foss., 1878, p, 105. 
JPentacrinus australis, Eth. fil., Geol. Pal. Q’land., &c., p. 439, t, 20, f. 1-3. 
Isocrinus australis, Eth. fil.. Bull. Geol. Survey Q’lancl., 1901, No. 13, p. G, t. 1, f. 4, t. 3, 
f. 1-3. 
Obs. — I believe the subject of the above figures represents a small 
individual of Isocrinus australis, but like the larger example lately figured 
by me, is imperfect. 
The specimen consists of a portion of the dorsal cup, and the remains 
of three rays, with six primibrachialia. I cannot distinguish any specific 
difference between this specimen and that previously referred to I. australis 
in the Sweet Collection. It is, however, of very great interest as affording 
another palaeontological link betw^een our Upper and Lower Cretaceous. 
Columnals are absent, the centre of the dorsal cup being obscured by 
fracture, but three of the first brachials (I Br.), are jiresent and aj)parently 
entire, with a iiortion of a fourth. Three of the first radials are distinctly 
visible, and the second and third radials of three rays are preserved. 
The fixed brachials (I Br.), as in the larger specimen described else- 
where, resemble small knobs or nodes, and the three third radials arc axillary 
also. The largest number of primibrachs (1 Br.) on any one arm is twelve, 
and the twelfth is primaxil (I ax.) The other arm divisions arc brokcii 
* RiHlefinecl, Latlier, 1898. 
