COL UMNARIAD^E. ! 95 



Columnaria alveolata, Goldfuss. 

 (PI. X, figs, i, i a.) 



Columnaria alveolata, Goldfuss, Petref. Germ., t. i. p. 72, PI. XXIV., fig. 7, 



1826. 

 multiradiata, Castelnau, Sil. Syst. de 1'Ame'r. sept., p. 44, PI. 



XIX., fig. i, 1843. 

 Favistella stellata, Hall, Pal. N.Y., vol. i. p. 275, PL LXXV., fig. i, 1847. 



(Non Columnaria alveolata. Hall, ibid., p. 47.) 

 Columnaria alveolata (pars), Milne-Edwards and Haime, Pol. Foss. des Terr. 



Pal., p. 309, 1851. 

 ,, GotMandica, Milne-Edwards and Haime, ibid., p. 309, PI. XIV., 



figs. 2, 2 a, 1851. 

 Favistella stellata, Nicholson, Sec. Rep. Pal. Ont., p. 23, 1875, and P^- Ohio, 



vol. ii. p. 185, 1875. 

 Columnaria stellata, Rominger, Foss. Cor. of Michigan, p. 90, PI. XXXIV., 



fig. 3, and PI. XXVIII., fig. i, 1876. (Non Columnaria 



alveolata, M'Coy, Hall, Billings, Rominger, &c.) 



Spec. Char. Corallum massive, subhemispheric, or pyriform, 

 often attaining a very considerable size. Corallites prismatic, 

 hexagonal or pentagonal, but often more or less drawn out 

 along one axis, the larger ones being from rather less than two 

 to over three lines in their long diameter, and having numerous 

 much smaller tubes interspersed amongst them. Walls of the 

 corallites more or less amalgamated, the line of division between 

 contiguous tubes still remaining quite distinct. Mural pores 

 apparently wanting. Septa unequally developed, alternately 

 large and small, the latter quite rudimentary, and the former 

 extending usually across two-thirds of the distance between the 

 wall and the axis of the visceral chamber, or even reaching the 

 last-mentioned point. The septa are thin and flexuous but 

 completely lamellar, and the number of each series varies from 

 about twelve to fifteen or more. Tabulae complete, horizontal, or 

 somewhat flexuous, about six in the space of two lines. Calices 

 polygonal, unequally- sized, moderately deep, with thin margins, 

 usually closely contiguous, but sometimes separated by slight 

 interspaces ; the floor formed by the uppermost tabula, the 

 surface of which is striated by the radiating septa. 



