224 Dr. H. A. Nicholson and Mr. R. Etheridge, Jun., on 



tubuli is greater than in some European examples and less 

 than in others. On the whole the interspaces occupied by the 

 tubuli are perhaps greater in the Queensland examples. 



In vertical sections we can distinguish with ease the tabular 

 as described by Edwards and Haime, horizontal, but some- 

 times oblique. These authors describe the ccenenchymal 

 tubuli as " nearly regularly hexagonal." Certainly this is the 

 case with some of the tubes on various parts of the Queensland 

 specimens ; but we find by far the commoner form is the poly- 

 gonal. 



Locality and Horizon. Broken River, North Queensland, 

 in rolled blocks {Daintree) ; Limestone of the Fanning River, 

 Burdekin Downs, N. Q., in situ {Jack) ; Limestone of Arthur's 

 Creek, Burdekin Downs, in situ {Jack). Devonian. 



Collectors. The late R. Daintree, Esq., and R. L. Jack, 

 Esq. {Coll. Geol. Survey of North Queensland and Brit. 

 Mus.) 



Heliolites Daintreei, Eth., Jun., and Nicholson. 

 (PI. XIIL figs. 3, 3a.) 



Spec. char. Corallum compound, discoid or flattened; upper 

 surface a little convex ; under surface more or less flattened, 

 concentrically wrinkled round the edges. Calices large, equal 

 in size, with a diameter of f line, or at times almost 1 line, 

 closely set; calicular edge deeply scalloped. Septa numerous 

 and well-marked, certainly fourteen and sometimes more, 

 unequal in size. Ccenenchyma composed of large and well- 

 developed tubes separating the corallites by irregular inter- 

 spaces, often of small extent. A specimen measures 3^ inches 

 by nearly 4. 



Obs. We have separated from the foregoing specimens one 

 which appears to us to possess characters sufficiently worthy 

 of specific distinction. 



It may be distinguished by the size and contiguity of the 

 large corallites, with their strongly scalloped margins. The 

 ccenenchymal tubuli are irregularly developed ; for between 

 neighbouring calices we occasionally see only one row of tubes, 

 but more commonly the number is increased to two. The latter 

 number varies up to three or four, beyond which we have not 

 observed them to be increased. 



In the contiguity of its calices and frequent diminution of 

 the tubuli, H. Daintreei resembles H. megastoma, M'Coy, of 

 the British Silurian rocks, but is at once distinguished by the 

 prominent scalloped edges of the calices, and the flat or little- 

 convex form of the corallum. 



In the contiguity of the corallites one to the other there is 



