COELENTERATA CNIDABIA 



SUB-BRANCH II 



fossula. Surface marked with pinnately branching striae. Tabulae numerous. 



Silurian. 



Chonophyllum, E. and H. Silurian and Devonian. 



Ptyctiaphyttvm, E. 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. 



FIG. 122. 



J.nitxiliilvin. Jlorifiinitix. Lolisd. 

 Carboniferous Limestone ; Kildare, 

 Ireland, l/i- a, Two cylindrical 

 corallites, partially split open ; 

 /'. Two hexagonal calices, seen from 

 above. 



Phillipsustraea Hennahi, E. and H. Devonian limestone ; Ebersdorf, 

 Silesia. , Upper surface ; I, Transverse section. Natural size. 



Cydophylhim, Duncan and Thorn. Simple, cylindro-conical. Septa numer- 

 ous, the longer ones forming a thick pseudo-columella with enclosed spongy 

 tissue. 



Aulophyllwn, E. and H., Aspidophyllum, fiJwdophyllum, Xich. and Thorns., 

 etc. Carboniferous. 



Ltifwstrotwn, Llwyd. (Stylaxis, M'Coy ; Petalaxis, E. and H.), (Fig. 121). 

 Fasciculate or astraeiform stocks composed of prismatic or cylindrical corallites. 



FIG. 124. 



Stauria n.<ii-neiforttiis, E. and H. Silurian; Gottland, Sweden. A, Transverse section^hrillel to upper 

 Mii-f'acr. 7J, Enlarged transverse section of individual corallitc. I'. Several calices from above. Natural >i/e 

 (after Nicholson). 



Septa numerous, alternately long and short. Styliform columella in the centre. 

 Abundant in Carboniferous limestone. 



Lonsdaleia, M'Coy (Fig. 122). Fasciculate or astraeiform, composite 

 coralla. Septa well developed ; columella large, composed of vertically rolled 

 lamellae. Central tabulate area bounded' by an interior dissepimental wall, 





