86 



COELENTERATA— ANTHOZOA 



PHYLUM II 



peripheral edges are thickened and are fused with one another so as to form a 

 wall. Silurian (P. patellatum Schlot, sp.) and Devonian. 



Cyclophyllum Duncan and Thom. Simple, cylindro-conical. Septa numer- 

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



tissue. 



Aulophyllum E. and H. ; Asjpidophyllum, Bho- 

 dophyllum Nich. and Thoms., etc. Carboniferous. 

 Lithostrotion Llwyd (Stylaxis M'Coy ; Fetalaxis 

 E. and H.) (Fig. 117). Fasciculate or astraei- 

 form Stocks composed of prismatic or cylindrical 

 corallites. Septa numerous, alternately long 

 and short. Styliform columella in the centre. 

 Abundant in Carboniferous limestone. 



Fig. 118. 



Lonsdaleia floriformis Lonsd. Car- 

 boniferons Limestone ; Kildare, Ire- 

 land. i/i. a, Two cylindrical corallites, 

 partially splitopen ; h, Twohexagonal 

 calices, seen from above. 



Fig. 119. 



Phillipsastrea hennaM (Lonsdale). Devonian limestone ; Ebersdorf, 

 Silesia. a, Upper surface ; h, Transverse section. Natural size. 



Lonsdaleia M'Coy (Fig. 118). Fasciculate or astraeiform, composite 

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

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

 between which and the theca vesicular endotheca is abundantly developed. 

 Common in Carboniferous rocks. 



Strombodes Schweigg. Astraeiform Stocks composed of small prismatic 

 corallites. Septa extremely numerous, very slender, extending to the centre. 



Fig. 120. 



Stauria astraeiformis E. and H. Silurian ; Gotland, Sweden. A, Transverse section parallel to upper 

 aurface. B, Enlarged transversa section of individual corallite. C, Several calices from above. Natural size 

 (after Nicholson). 



Theca imperfectly developed. Visceral Chamber filled with infundibuliform 

 tabulae and vesicular tissue. Silurian (S. typus M'Coy sp.) and Devonian. 



Fachyphyllum, Spongophyllum E. and H. Silurian and Devonian. 



Acervularia Schweigg. Astraeiform or bushy colonies. Septa stout and 



