SUB-CLASS II TABULATA—FAVOSITIDAE 99 
sometimes tubiform mural pores. The corallites are usually polygonal in 
contour, and their walls exhibit in transverse sections a dark, or sometimes 
light-coloured median line, with thickenings of stereoplasma on either side (Fig. 
UES 
wats? 
Pdi ila =P 











































ip p 
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Fia. 174. 
Favosites polymorpha, Goldf. sp. Devonian; Hifel. A, Corallum, natural size. B, Corallites enlarged, two 
of them broken open and showing tabulae. Cand D, Transverse and longitudinal sections showing spiniform 
septa and mural pores (p). (C and D alter Nicholson.) 
174, C). The family is exclusively Palaeozoic, and plays an important part 
in the formation of Silurian, Devonian, and Carboniferous coralline limestones. 
Fuvosites, Lam. (Calamopora, Goldf.), (Fig. 174). Corallum massive, more 
rarely branching. Corallites prismatic, polygonal, 
generally hexagonal. Mural pores distributed at 
considerable intervals. Septa very faintly developed, 
represented by longitudinal ridges or rows of spines, 
or occasionally obsolete. Tabulae numerous. Ordo- 
vician to Carboniferous ; very abundant in Silurian 
and Devonian. 
Columnopora, Nich. (Calapoecia, Bill.) Like the 
preceding, but with numerous, short, well-marked 
septa. Mural pores large, disposed in vertical rows 
between the septa. Ordovician. Pachypora Nicholsoni, Frech. 
Emmonsia, E. and H.; Ordovician to Carboniferous. ee eee eT natn 
Nyctopora, Nich. ; Ordovician (Trenton). Syringolites, CeaeNicheee 2, Mural pores 
Hinde ; Silurian (Niagara). 
Pachypora, Lind. (Fig. 175). Corallum branching, composed of prismatic, 
polygonal corallites, the walls of which are so thickened towards their mouths 
by layers of stereoplasma that the calices appear to have 
circular contours. Septa very minute; mural pores 
scanty, but often of large size. Abundant in Silurian 
and Devonian. 
Trachypora, FE. and H. Dendroid with cylindrical 
stems. Corallites polygonal ; walls so thickened by layers 
A LD 


Striatopora flecuosa, Hall. 5 
Silurian (Niagara) ;’ New of stereoplasma that the calices become round and greatly 
York. t Smo fs 
a contracted, and appear to be superficially widely separated. 
Mural pores few and irregularly distributed. Septa represented by rows of 
spines. Tabulae remote. Common in Devonian. 
