On Palaiozoic Corals from Northern Queensland. 265 



coenenchynia respectively (figs. 2-5) ; but when magnified, as in 

 fig. 6, on a much lower scale, being smaller, it might, without 

 this explanation, lead to the idea that the stellate venation was 

 much smaller than the general coenenchymal structure, while it 

 is greatly the revei'se. 



Fit/. 7. Favosites gothlandicus. a, portion of surface, to show the hexa- 

 gonal form of the cells ; b, portion of vertical section, to show 

 the vertical septa or walls of the cylinders traversed by the 

 tabula. 



Pig. 8. Labechia conferta. a, horizontal section, to show the arrangement 

 of the rods or pillars, and the lines (tabula) traversing their 

 interspaces — also that they were hollow, as indicated by the 

 white centre now filled with transparent calcite; b, vertical 

 section, to show the same, but with closure of the pointed free 

 extremities. 



N.B. These figures (viz. 7 and 8) are all magnified upon the 

 same scale, viz. two diameters, and are slightly diagrammatic, to 

 show how the rods and tabula? of Labechia, replacing the cylin- 

 ders and tabulae of Favosites, present an analogous struc- 

 ture to the rectilinear coeuenchyma of Stromatopora (figs. 2 

 and 3). 



XXX. — Descriptions of Palaeozoic Corals from Northern 

 Queensland, with Observations on the Genus Stenopora. 

 By H. A. Nicholson, M.D., D.Sc, F.G.S., &c., Professor 

 of Natural History in the University of St. Andrews, and 

 R. Etheeidge, Jun., F.G.S., of the British Museum. 



[Plate XIV.] 

 [Continued from p. 226.] 



Genus Stenopoea, Lonsdale, 1844. 



Stenopora, Lonsdale, Darwin's Geol. Obs. Vole. Islands, 1844, p. 101 



(note). 

 Stenopora, Lonsdale, Strzelecki's Phys. Descr. New South Wales &c, 



1845, p. 262. 

 Tubuliclidia, Lonsdale, Bull. Soc. G6ol. de France, 1844, 2nd ser. i. 



p. 497. 

 Tubuliclidia, Lonsdale, Murchison's Geol. Russia, 1845, vol. i. pp. 221 



and 631 (note). 



Gen. char. Corallum ramose or sublobate, rarely massive, 

 rooted below, and composed of tubular corallites, which are 

 nearly vertical in the centre of the branches, and radiate out- 

 wards, from an imaginary axis, to open on all points of the 

 free surface. Corallites polygonal, thin-walled, and more or 

 less completely in contact in the centre of the branches ; but 

 in the outer curved portion of their course more or less cylin- 

 drical, and annulated by periodical ring-shaped thickenings, 

 which are placed at corresponding levels in contiguous tubes, 



