CORALS FROM THE SILURIAN FORMATION. 267 



3. Monticulipoka Fletcheri. Tab. LXII, figs. 3 3 3«. 



Calamopora spongites ? var. Goldfuss, Petref. Germ., vol. i, p. 216, pi. 64, fig. 10 (in parte), 



1833. 

 Favosites spongites (pars), Lonsdale, in Murchison, Silur. Syst., pi. xv bis, figs. 9, 9a, 96 



(cset. excl.), 1839. 

 Ch^tetes Fletcheki, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaeoz. (Arch, 

 du Mus., vol. v), p. 271, 1851. 

 — lycopekdon (pars), J. Hall, Paleont. of New York, vol. ii, p. 40, pi. xvii, 



figs. 1 g — i (cset. excl.), 1852. 



Corattum dendroidal ; branches about one and a half or two lines in diameter, and not 

 bearing any well-characterised tubercles. Calices of two kinds ; some circular, very closely 

 set, and about one eighth of a line in diameter ; others subpolygonal, much smaller, and 

 placed between the former ones. 



Dudley. North America, in the Clinton group (J. Hall). 



Specimens are in the Collections of the Geological Society, of Mr. Fletcher, of the 

 Museum of Paris, &c. 



By its general form M. Fletcheri resembles M. pulchella, 1 but its branches are slenderer, 

 and bifurcate under a more obtuse angle. Both these species are almost deprived of the 

 tubercles which are in general so remarkable in the corals of this genus, but the mode of 

 arrangement of the calices differs : in M. pulchella, the large calices are in general col- 

 lected in groups amongst the smaller ones ; whereas, in M. Fletcheri, the smaller cells 

 are set irregularly between the large ones, which vary but little. 



4. Montictjlipora pulchella. Tab. LXII, figs. 5, 5a, 53. 



Ch^etetes pulchellus, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., 



p. 271, 1851. 



Corallum ramose ; its branches often somewhat compressed, and from two to four lines 

 in diameter. Tubercles broad, not very prominent, and somewhat stellated. Calices 

 rather regularly hexagonal, and very unequal in size ; those that occupy the centre of the 

 tubercles about one fifth of a line in diameter, and at least twice as large as those placed 

 in the intervals between the groups thus formed. 



Wenlock, Dudley, Coalbrook Dale. 



Specimens in the Collections of the Geological Society, of Mr. Fletcher, &c. 



This species, as we have already mentioned, much resembles Monticulipora Fletcheri? 

 but differs from it by the mode of grouping of the cells, and the size and the angle of 

 bifurcation of its branches. 



1 See tab. lxii, figs. 5, 5a. 2 See tab. lxii, fig. 3. 



