CORALS FROM THE SILURIAN FORMATION. 255 
equal in size, rather thick towards the walls, but very slender towards the centre of the 
corallites. Diameter of the calices about one third of a line. 
Upper Silurian beds of Dudley. Collection of Mr. J. Gray. 
This species differs from P. petaliformis' by the calices being much smaller, and more 
closely set, and by the septo-costal radii being more regular. 
3. Genus PRopora, (p. lix.) 
Propora tTuBuLaTA. ‘l'ab. LIX, figs. 3, 3a, 34. 
Porites TUBULATA, Lonsdale, in Murchison, Silur. Syst., p. 687, pl. xvi, fig. 3, 1839. 
ASTREOPORA TUBULATA, LONSDALEI, and Granpis, D’Orbigny, Prodr. de Paléont., vol. i, 
p. 50, 1850. 
PaLHopora TUBULATA, M‘Coy, Brit. Paleeoz. Foss., p. 18, 1851. 
Propora TuBULATA, Milae Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz. (Archives 
du Mus., vol. v), p. 224, 1851. 
HELIOLITES ELEGANS and sPintpora? J. Hall, Paleont. of New York, vol. ii, pp. 130, 131, 
pl. xxxvi, figs. 1, 2, 1852. 
Corallum massive, irregularly convex; common basal plate covered with a epitheca 
presenting concentric folds; upper surface convex or subgibbose.  Calices circular, 
somewhat unequal in size, and surrounded with a slightly prominent edge that is 
crenulated in consequence of the prolongation of the septa beyond the walls, where they 
constitute small, thick cos¢z, which are sometimes sufficiently developed to attain those of 
the adjoining corallites. In general, 12 septa, slightly exsert, rather thick exteriorly, and 
somewhat unequal in size. Diameter of the calices usually about half a line. 
A vertical polished section shows that the wad/s are distinct ; the tabula closely set, 
concave in the middle, sometimes quite horizontal, and at others irregularly placed ; the 
space situated between the walls of the adjoining corallites occupied by an abundant, 
irregular exothecal tissue. Some of the dissepiments composing this tissue are horizontal, 
and assume the appearance of small extramural tabule, but others constitute vesicular cells. 
No traces of the costee are seen in this exothecal mass. 
The specimens here described were from Dudley and Wenlock. ‘The localities 
mentioned by Sir R. Murchison are Woolhope Valley, Benthall Edge, Ledbury, Woodside 
near Nashsur, Fownhope, and the west parts of the Malvern Hills, between Asten Ingham 
and May Hill; by Professor M‘Coy, Aymestry, in Herefordshire ; Altgoch, Llanfyllin, in 
Montgomeryshire; Golugoed; Mulock, Dalquorhan, in Ayrshire. The same species is 
found in Gothland and in Bohemia. 
Specimens are in the Collections of the Museum of Practical Geology, of the Geological 
Society, of the Museum of Paris, &c. 
1 See tab. lix, fig. 1. 
