Palceozoic Corals from Northern Queensland. 281 



thin sections, to preserve their polygonal outline, in spite of 

 the thickening to which they are subjected ; in the axis of the 

 branches they are regularly polygonal ; and even the thick- 

 ened lips of the calices show more or less distinctly a poly- 

 gonal line placed at a little distance from the mouth of the tube, 

 which represents the original wall. On the other hand, in P. 

 meridionalis the polygonal form of the corallites is more or 

 less completely obliterated, even in the axis of the branches 

 the originally prismatic wall cannot be detected, and the 

 thickened lips of the calices are simply rounded and obtuse. 



c. In P. ceroicornis the calices are about half a line in 

 diameter, rounded or subpolygonal, and only occasionally 

 opening into one another. In P. meridionalis, on the con- 

 trary, the calices are mostly only about a third of a line in 

 diameter (counting in, as before, the wall around them), their 

 shape is very irregular, and they open into one another so 

 frequently, and to such an extent, that they sometimes become 

 almost vermiculate in character. 



Upon the whole, therefore, we consider the present species 

 to be sufficiently distinct from P. cervicornis, De Blainv., to 

 deserve a separate name ; and we know of no other adequately 

 characterized species with which it is necessary to compare it 

 in detail. We may add that the differences between P. meri- 

 dionalis and P. cervicornis, which we have above alluded to, 

 are much more conspicuous if we take specimens of the form 

 usually known by the latter name in the Devonian Limestones 

 of Devonshire, and figured as such by Milne-Edwards and 

 Haime (Brit. Foss. Cor. pi. xlviii. fig. 2). 



Locality and Horizon. In Devonian Limestone (apparently 

 abundant), Fanning River, Burdekin, N. Queensland ; Lime- 

 stone of Arthur's Creek, Burdekin Downs, N. Queensland. 



Collector. R. L. Jack, Esq., F.G.S. 



Pachypora ? sp. ind. 



Obs. A second and ramose form, in all probability referable 

 to this genus, occurs in the Fanning-River Limestone ; but the 

 state of preservation did not permit of our making thin sec- 

 tions ; so that we can do no more than simply record the occur- 

 rence of it. The same form is also met with at Reid. 



Collector. R. L. Jack, Esq. 



Genus TRAfcHYPORA, Edw. & Haime, 1851. 

 (Poljp. Foss. Ten-. Pal. p. 305.) 



Tracliypora, sp. ind. 

 Obs. So far as we are aware, Trachypora has not been 



