19 
Genus — PLASMOPOE-A, Milne Edwards and J. Uaime. 
Plasmopoea petalipoemis, Lonsdale. 
F Orites petaliforniis, Lonsdale, 1859, in Murchison’s Silurian System, p. 687, pi. 16, fig. 4. 
F alceopora, ,, McCoy, 1851, Brit. Pal. Boss., p. 17. 
Flasniopora ,, Milne Edwards and J. Haime, 1852, Mon. Brit. Boss. Corals, p. 253, 
pi. 59, fig. 1. 
FEeliolites ,, Salter, 1859, in Murchison’s Siluria, p. 534, pi. 39, fig. 4. 
Coralluni hemisplierical or sublenticular, and protected by an cpitlieca 
with concentric folds. Calices circular, subequal, and through the presence 
of septa having a star-like appearance ; septa twelve, prolonged almost to 
the centre of the calice. Tabulse fairly close. 
Horizon and Localities. — In the Upper Silurian of England and 
Ireland ; a small well-preserved specimen was found with the preceding 
species on the banks of the Bell. 
Genus — HELIOLITES, Lana. 
1. Heliolites megastoma, McCoy. 
Forites pyriforniis (pars), Lonsdale, 1839, in Murchison’s Silurian System, p. 686, pi. 16, 
fig. 2d and 2e {ccet. excl.) 
,, niegastonia, McCoy, 1846, Sil. Foss. Ireland, p. 62, pi. 4, fig. 19. 
Fcdceopora „ Idem, 1851, Brit. Pal. Boss., p. 16, pi. Ic, fig. 4. 
Heliolites ,, Milne Edwards and J. Haime, 1852, Mon. Brit. Boss. Corals, p. 251, 
pi. 58, fig. 2. 
,, interstinctus, Salter, 1859, in Murchison’s Siluria, p. 533, pi. 39, 2d and 2i?, 
{c(zt- excl.) 
Coralluni hranching, irregularly rounded, calices circular, two or 
three millimetres in diameter, and ivithout prominent edge to the margins. 
Coenenchyma little developed ; cells cubical and fairly regularly arranged 
in numerous rows. Walls thin ; tabulte numerous and close. 
Horizon and Localilies . — I have seen only a few specimens of this 
species in the quartzites of Burrawaug. In England and Ireland it occurs in 
the upper beds of the Silurian. 
E 
