BY T. GRIFFITH TAYLOR. 59 



Other Australian Genera. — The only other Mastoids occurring 

 in Australia are those from the Gympie (Carboniferous) Beds of 

 Rockhampton, Q. Both from the descriptions and the figures 

 given by Etheridge in " The Geology of Queensland," there is no 

 doubt that — imperfect as are the specimens under discussion — a 

 genus new to Australia has been discovered. The three are 

 designated Mesoblastus australis, Granatocrinus wachsmuthii, 

 Triccelocrinus carpenteri, and the characteristics separating the 

 Glen william specimens from these genera have already been 

 discussed. 



Conclusion. 



A noteworthy characteristic is the large size of the blastoid 

 under discussion. None of those figured in Etheridge and Car- 

 penter's Monograph approach it, except perhaps an allied genus, 

 Triceelocrinus obliquatus (Plate xviii., fig-. 10), of which a radial 

 only is sketched. 



The following is a brief description of the blastoid : — Calyx 

 narrow elongate (probably 7-8 cm. in length) with contracted 

 oral surface. Ambulacra of medium length, narrow and linear, 

 and reaching nearly half-way along the radials. Lancet plate 

 covered by side plates, latter lying in deep grooves and approach- 

 ing 50 in number. Older side plates alternating with side plates 

 and with three lateral grooves on under surface of each plate. 

 Deltoids certainly small and probably overlapped by radials. 

 Radials very long, over § of length of calyx, and exhibiting a 

 profile angle of 140°; distinctly convex in cross-section. Basals 

 rather short and narrow, forming a conical cup. 



Log. — In the bed of Cherry Creek * about \ mile north of 

 Berry's farm, Glenwilliam, Clarence Town, N.S.W. 



Age. — Carboniferous. 



Name. — One of the Troostoblastidse, provisionally classed with 

 Metablastus. 



In conclusion I desire to thank Professor David and Mr. W. 

 S. Dun for suggestions assisting the preceding investigation, 

 especially with regard to the structure of the side plates. 



* Cherry Creek, 2| miles north of Clarence Town, is shown on Mr. Jaquet's 

 map of the Williams River area, in the Memoir on the Iron Ore Deposits of 

 N.S.W. (Geol. Survey N.S.W. Mem. No. 2). 



