528 PALAEONTOLOGY OF QUEENSLAND, 



stereoplasma, but the primordial septa still plainly visible. The 

 wall, or more properly speaking the theca, is formed by septal 

 outgrowths infilled with stereoplasma, and its thickness, combined 

 with the brevity of the septa, tends to impart a markedly sturdy 

 appearance to the corallum. 



These notes may tend to call the attention of Collectors to these 

 corals, and perhaps facilitate further acquisition. 



Sub-Kingdom—A N N U L O >S A. 



Class — Crustacea. 



Order-TRILOBITA. 



Family— PRCETID^. 



Genus — Gr rifpithides, Portlock, 1843. 



(Geol. Report Londonderry, Arc, p. 310.) 



Griffithides Sweeti, Elh.fil. 



(PI. XXXIX. fig. 3.) 



Griffithides Sweeti, Eth. fil. (ms.), Mem. Geol. Survey N. S. 

 Wales, Pal. No. 5, Pt. 2, 1892, p. 125. 



Sp. Char. — General form oblong. Cephalon not fully preser\ed, 

 but the glabella pyriform-oval ; basal lobes oval, large and promi- 

 nent, deeply divided off, with a small supplementary lobe beneath, 

 and at outer upper end of the neck segment, which is convex, and 

 longer fore and aft than any of the thoracic segments ; surface of 

 all lobes highly granulate. Thoracic axis very convex, of ten 

 segments ; pleurae angularly bent downwards along the middle 

 line. Pygidium semicircular, large ; axis of twelve, and pleura? 

 apparently of ten segments ; limb wide, convex, and well arched 

 downwards. 



06s.— This is an abnormal form, departing both from Phillipsia 

 and Griffithides in possessing ten instead of nine thoracic segments, 

 and in the presence of the supplementary basal lobes on the 

 cephalon. So far as I can see there is no clear evidence of such 



