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76 list one of the largest fossil Crinoids known, Oyathocrinus Koninc/ci, Clarice, to redescribe Tribrachiocrinus Clarkei, McCoy, and to indicate tbe probable presence of other genera from tlieir fragmentary remains. In 1834 the list Avas increased by the late Mr. Felix Ratte describing a second species of Tribrachiocrinus; 1 and lastly, by Messrs. Waclismutli and Springer, in their most comprehensive “ Revision of the Palteocrinoidea,” defining' 1 2 Tribrachiocrinus according to the more recently accepted 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 Hill; Roucliel Brook, about six miles from the Hunter River Junction, and other places. At Flat-rock Creek the portions of stems obtained are fairly large, and resemble those of Poteriocrinus crassus, of the European Carboniferous Limestone. The chief horizons from whence determinable Crinoids have been obtained are the Muree Rock, 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 River Hunter. One very strong fact, however, stands prominently forward, that so far as our field operations have as yet disclosed, the genera Tribrachiocrinus and Phialocrinus are not known out of the Permo-Carboniferous, and are particularly characteristic of the Upper Marine Series. 1 Proc. Linn. Soc. N. S. Wales for 1884 [1885], IX, Pt. 4, p. 1158. 2 Revision of the Paheocrinoidea, 1886, Pt. Ill (2), p. 251 (175).