14 F. Clta'p'inan : 



the twisted funnel-like form of the sponpfe. About 

 natural size. 

 Fig. 4-7. — Wax impressions from the nep-ative siliceous casts 

 of R. australis from Mt. Wyatt, Queensland. 

 Figs. 4 and 7 show the relation of the heads of 

 the vertical pillars to thc' first layer of horizontal 

 spicules. Figs. 5 and 6 are impressions taken 

 from the horizontal spicular layers. About 

 natural size. 



Plate III. 



Fig. 1. — R. australis, Mt. Wyatt, Queensland. A specimen 

 showing negatively the rhombic plates of the 

 inner surface of the cup, and the underlying layer 

 with the heads of the vertical pillars. [7504]. 

 About natural size. 

 ,, 2. — R. australis, Mt. Wyatt. External surface of cup, 

 showing central pedicle and characteristic radial 

 and concentric lines. [7505]. About natural size. 



Plate IV. 



Fig. 1. — R. fergusoni, sp. nov. Impression of mud-cast in wax, 

 showing the depressed, rhombic summit plates 

 with crenulated margins ; also traces of horizontal 

 spicules. [2317]. x 8. 



„ R. australis, Salter. Middle Devonian ; Cavan, New 

 South Wales. A bifiu'cate spicule with trace of 

 axial canal; in calcite. [7516]. x 28. 



„ 3. — R. anstralis. Cavan, New South Wales. Part of a 

 fused spicular layer ; in calcite. Found com- 

 mingled with other fragments of spicular mesh 

 in the matrix, close to the series of vertical 

 pillars. [7516]. x 28. 



„ 4. — R australis. Middle Devonian; Bindi, Gippsland, 

 Victoria. A transverse section of a vertical pillar, 

 showing a fine inner circumferential layer of 

 scalenohedra of calcite, succeeded by irregular 

 rhomb-faced crystals of the same mineral. The 



