78 COELENTERATA—CNIDARIA SUB-BRANCH II 
fossula. Surface marked with pinnately branching striae. Tabulae numerous. 
Silurian. 
Chonophyllum, E. and H. Silurian and Devonian. 
Ptychophyllum, FE. and H. Simple and turbinate, or composite. Each 
stock is composed of funnel-shaped, invaginated 
layers, representing calicinal buds, the marginal lips 
of which are more or less reflected outwards. Septa 
numerous and strongly twisted in the centre to form 
a pseudo-columella ; their peripheral edges are thick- 
ened and are fused with one another so as to form 
a wall. Silurian (P. patellatum, Schlot. sp.) and 
Devonian. 
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Lonsdaleia jfloriformis, Lousd. 
Carboniferous Limestone; Kildare, 
Ireland. 1/;. a, Two eylindrical 
corallites, partially split open ; 
b, Two hexagonal calices, seen trom 
above. 
Fic. 123. 
Phillipsastraea Hennahi, E. and H. Devonian limestone; Ebersdorf, 
Silesia. a, Upper surface; ), Transverse section. Natural size. 
Cyclophyllum, Duncan and Thom. Simple, cylindro-conical. Septa numer- 
ous, the longer ones forming a thick pseudo-columella with enclosed spongy 
tissue. 
Aulophyllum, FE. and H., Aspidophyllum, Rhodophyllum, Nich. and Thoms., 
ete. Carboniferous. 
Lithostrotion, Llwyd. (Stylaais, M‘Coy ; Petalaxis, FE. and H.), (Fig. 121). 
Fasciculate or astraeiform stocks composed of prismatic or cylindrical corallites. 


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Fic. 124. 
: Gottland, Sweden. «A, Transverse section parallel to upper 
Stauria astraeiformis, E. and H. Silurian Z ) 
C, Several calices from above. Natural size 
surface. 2B, Enlarged transverse section of individual corallite. 
(after Nicholson). 
Septa numerous, alternately long and short. Styliform columella in the centre. 
Abundant in Carboniferous limestone. 
Lonsdaleia, M‘Coy (Fig. 122).  Fasciculate or 
coralla. Septa well developed ; columella large, composed of vertically rolled 
Central tabulate area bounded by an interior dissepimental wall, 
astraeiform, composite 
lamellae. 
