Victorian Fossils, Part XII. 309 



hiforat^, being smaller and not so spiriferoid in shape. The 

 jiellets forming this rock were described in the note above re- 

 ferred to as follows: — "These form a large part of some of the 

 limestones, perhaps as much as 40 or 50 per cent., but their 

 intimate structure has been entirely removed by secondary 

 crystallisation, and only traces of the concentric mode of growth 

 can be seen, together with a nucleus of a shell-fragment or 

 crinoid joint." 



There is now little doubt tliat the Girvdiielhi and trilo- 

 bite limestones occur in or near the same stratigraphical horizon, 

 and that the former may be older than was originally thought 

 from the field and palaeontological evidence. Another and 

 similar specimen of Girvanella limestone was subsequently ob- 

 tained by Mr. E. J. Dunn, F.G.S., Director of the Geological 

 Survey, from Roan Horse Gully, Wellington River, and this was 

 reported upon by the writer in 1908.^ The pellets were there 

 referred to as being from. 5 to 6 mm. in length, and crinoid 

 ossicles were seen in the rock in great abundance. 



These (jrirranella limestones are of a good blue-grey colour, 

 and would make a handsome marble for ornamental purposes 

 when polished. 



Horizon. — Upper Cambrian. Brachio])od Zone. Roan Horse 

 Gully. 



Animalia. 



Class Crinoidea. 



Crinoid stem^joints and ossicles, indet. (Plate LIX., Figs. 16 a, 



h., 17 a, h.) 



Bexrri iition . — Two isolated specimens of stem-joints were ob- 

 tained from the pale grey limestone by fracture. 



A. — A series of eight conjoined infranodals, very low ; form- 

 ing part of a stem circular in section ; the axial canal pentagonal 

 or rosette-form ; articular facets indistinctly radially striate, 

 and slightly crenulate at the margin. Diameter, 4 \xva\. ; total 

 height, 3.1 nmi. (Fig. 16, «, h.) 



1 Rec. Geol. Surv. Vict., vol. ii., pt. iv., p. 211. 



