SUB-CLASS IT TABULATA—SY RINGOPORIDAE 101 
In these the walls of the corallites are represented by narrow fissures which 
are bridged across by transverse rods, while the visceral chamber is filled up 
with sandstone. P.. stylopora, Eaton, from the Hamilton Group of North 
America, is a closely related species, and also possesses the vermiform body. 
Michelinia, de Kon. (Fig. 179). Discoidal or hemispherical coralla, often 
of considerable size, and covered on the under surface with concentrically 
striated epitheca, which frequently develops hollow radiciform processes. 
Corallites polygonal, rather large. Septa represented by numerous longitudinal 
striae or ridges; mural pores irregularly distributed ; tabulae very numerous, 
oblique or curved, incompletely developed, and usually filling the visceral 
chamber with loose vesicular tissue. Devonian and Carboniferous. J/. favosa, 
de Kon., extraordinarily profuse in Carboniferous Limestone of Belgium. 
Family 2. Auloporidae. Nich. (Tubulosa, Milne-Edwards and Haime). 
Creeping, branching, or reticulated tubular coralla, composed of cylindrical, beaker, 
or trumpet-shaped corallites, with thick, imperforate, wrinkled walls. Septa represented 
by faint marginal striae ; tabulae moderately numerous or want- 
ing. Reproduction by basal or lateral gemmation. Ordovician 
to Carboniferous. 
Aulopora, Goldf. (Fig. 180). All the corallites of the 
prostrate corallum are attached by the whole of the lower 
surface to some foreign object (Alveolites, other corals, or 
mollusks). Tabulae more or less curved ; reproduction by 
basal gemmation. Ordovician to Carboniferous. 
Cladochonus, M‘Coy (Pyrgia, E. and H.)  Corallum 
branching, attached only at isolated points, and composed 
of funnel-shaped corallites without tabulae and __ septa. 
Reproduction by lateral gemmation. Carboniferous. 
Romingeria, Nich. (Quenstedtia, Rom.) Spreading, semi- 
erect, bushy coralla, only basally attached, and with eylin- he ee 
drical corallites increasing by lateral gemmation. Tabulae Goldf.\ Devonian; Gerol- 
. : : : stein, Hifel. Natural size 
moderately numerous, horizontal. Silurian and Devonian. — (atter Goldiuss). - 

Fic. 180. 
Family 3. Syringoporidae. Milne-Edwards and Haime. 
Fusciculate coralla composed of cylindrical corallites, united 
at intervals along the sides by hollow connecting processes or by 
horizontal expansions. Walls thick, wrinkled ; septa faintly 
developed, represented by delicate ridges or longitudinal rows 
of spinules ; tabulae numerously developed, usually irregularly 
funnel-shaped. Reproduction by basal gemmation or by buds 
arising from the connecting processes and horizontal expansions. 
Ordovician to Carboniferous ; maximum in Devonian and 
Carboniferous. 
Syringopora, Goldf. (Fig. 181). Fasciculate  coralla, 
often attaining considerable size, and composed of cylin- 
A A a Ra a drical, thin-walled, somewhat flexuose corallites ; the latter 
stone; Regnitzlosau, Fich- communicate by means of hollow, cylindrical, connecting 
telgebinge. Natural size. rocesses. Septa rudimentary; tabulae funnel-shaped. 

