178 On two Species o/* Alveolites and one o/" Amplexopora. 



sections do not yield very satisfactory results, on account of 

 the extensive mineral alteration that the fossil has undergone. 



In their longer diameter the corallites measure about two 

 thirds of a millimetre, in their shorter about one third, or even 

 less. The tabular are somewhat numerous, horizontal or 

 oblique, and sometimes curved, and in some places they 

 anastomose. Mural pores large and apparently numerous. 



Locality and Horizon. Regan's allotment, Northern railway, 

 31 miles from Towns ville. North Queensland. Devonian. 



Collection. Geological Survey of North Queensland, Towns- 

 ville, N. Q. 



Genus Amplexopoea, UL-ich, 1882. 



Amplexopora Koninchi^ Eth. & Foord. 

 (PI. VI. figs. 3-3 c.) 



The present species, like the others from the same locality, 

 has undergone a good deal of alteration by weathering and by 

 crystallization, so as to obscure, in a measure, the structure of 

 the organism. It was apparently a massive form. The 

 calices are polygonal in outline, with the angles rounded ; 

 minute and variable in size, somewhat thin-walled ; from three 

 to four occupy the space of 1 millim. Spiuiform corallites 

 may be seen in transverse sections at the angles of junction of 

 many of the cell-apertures. The corallites are well shown on 

 portions of the specimens in which the matrix that filled them 

 has been removed by weathering. In a longitudinal section 

 the tabulaj are seen to be remarkably regular in their dispo- 

 sition, and are placed horizontally in the tubes, from one to 

 two tube-diameters apart. The filling in of the coral is calcite 

 of fibrous structure (arragonite ?), the fibres cutting the walls 

 of the corallites, as well as crossing the visceral cavities. 



Ohs. It was not until a close examination had been made 

 of thin sections of this species that we were able to arrive at 

 a definite conclusion as to its afllinities ; and in this respect 

 material assistance was rendered us by the careful observa- 

 tions of the artist, Mr. A. S. Foord, to whose skilful hands 

 the execution of the plate had been entrusted. 



We were at first under the impression that it might be a 

 Chcetetes, but the presence of the spiniform corallites set this 

 question at rest. Not the least interesting fact is the dis- 

 covery of this genus at a new geological horizon, giving 

 to it a much greater geographical distribution. 



We beg to associate with this species the mame of Prof. L. 

 G. de Koninck, of Liege, the renowned Belgian palajonto- 

 logist. 



