APHROPHYLLUM HALLENSE AND LITHOSTROTION. DO 



The foregoing remarks are based on the examination of 

 only a very limited amount of material, and are not made 

 without reservation. 



Comparison of Aphrophyllum with Endophyllum. 



The internal structure of Aphrophyllum is distinctly 

 cyathophylloid — a structure common to many rugose corals, 

 not necessarily genetically related. In the wide zone of 

 dissepiments, and in the general arrangement of the septa, 

 it very closely approaches in appearance Endophyllum — a 

 Devonian genus; in fact, the transverse section is very 

 suggestive of E. abditum Edwards and Haime, as figured 

 in the Monograph of British Fossil Corals, Pal. Soc. 1853, 

 plate lii. fig. 6* It would, however, be unsafe to assume a 

 congeneric connection between the Carboniferous species 

 found in Australia and the Devonian genus of Europe. I 

 have, therefore, described the coral under a new generic 

 name, which can readily be relegated to synonymy should 

 the affinity of the form to Endophyllum be established at 

 any future date. 



The material included two small colonial masses and 

 several isolated corallites. In addition to these, there 

 was one solitary corallite which resembled the rest in its 

 general appearance, but differed from them in several 

 respects. It possessed about 60 septa, 30 in each cycle, 

 and the minor septa were longer than in the typical speci- 

 mens of A. hallense. The major septa did not quite reach 

 the centre of the corallite, but nevertheless, as in Apro- 

 phyllum, became twisted at their inner edge. In the 

 section (the only one obtainable) the middle of the corallite 

 was occupied by a tabula which rendered this part dense 

 and rather obscure. The septa appeared to reach the 

 epitheca, or to be separated from it only by a very narrow 

 zone of dissepiments, but the peripheral portion was incom- 

 plete. It is not permissible to draw any definite conclusion 



