CORALS FROM THE SILURIAN FORMATION. 269 
7. MoNTICULIPORA LENS. 
NeBuLtpora LENS, M‘Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. 6, p. 283, 1850. 
— — M‘Coy, Brit. Palzoz. Foss., p. 23, pl. ic, fig. 7, 1851. 
“ Corallum forming lenticular masses, averaging 10 lines in diameter, and 13 lines 
thick in the middle, gradually thinning to the edge; base slightly concave, with small 
concentric wrinkles ; upper surface evenly convex; clusters of large cells rounded, flat, or 
slightly concave, about 1 line in diameter, and usually a little more than their diameter 
apart (averaging from sixteen to twenty cells between one centre and another) ; smaller 
tubes averaging eight in one line, larger tubes of the clusters averaging four or five in one 
line; two inter-diaphragmal spaces equal the diameter of the tubes; apparently two 
irregular, close rows of connecting pores on each face of each tube (?). 
“ Caradoc sandstone of Horderly West ; schists of Moel Uchlas? Pont y Glyn, Diffwys, 
near Corwen; Cwm of the Cymmerig, Bala.” M‘Coy, op. cit. 
SrenoporA? GranuLosa, M‘Coy, Brit. Paleoz. Foss., p. 26; Ceriopora granulosa, 
Goldfuss, Petref. Germ., vol. i, tab. Ixiv, fig. 13; is a fossil coral from Dudley, which 
appears to belong to the class of Bryozoa. 
4. Genus Lasrcuetia.! 
1. Lasecurra conrerta. Tab. LXII, figs. 6, 6a, 64, 6c. 
MonticuLaria conrerta, Lonsdale, in Murchison, Silur. Syst., p. 688, pl. xvi, fig. 5, 1839, 
LaBecugra conrerta, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaeoz. (Arch. 
du Mus., vol. v), p. 280, 1851. 
Corallum massive, or forming lamellar expansions, which are often incrustating. 
Common basal plate covered with a thick, wrinkled epitheca; upper surface flat or sub- 
mammillar, and covered with small granular conical tubercles, which appear to rise from the 
edge of the walls; calices confluent and not distinct; visceral chambers filled up with 
complete, horizontal, closely set tabula, and presenting quite rudimentary septa. Walls 
thick, and not perforated. Breadth of the visceral chamber about a quarter of a line. 
In some specimens the marginal mural tubercles are ranged in regular series, so as to 
assume the appearance of small ridges. 
1 See Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz., p. 279, 1851. 
36 
