86 



COELENTERATA— ANTHOZOA 



PHYLUM II 



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

 wall. Silurian (P. jnitellatum Schlot. sp.) and Devonian. 



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

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

 _ tissue. 



Aalophyllwn E. and H. ; Aspidophyllum, Eho- 

 dophyllum iSTich. and Thorns., etc. Carboniferous, 

 LitJiostrotion Llwyd (Stylaxis M'Coy ; Petalaxis 

 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/j. a, Two cylindrical corallites, 

 partially split open ; h, Two hexagonal 

 calices, seen from aljove. 



Fig. 119. 



PMlKpsastrea hennahi (Lonsdale). Devonian limestone ; Ebersdorf, 

 Silesia, a, Upper surface ; 1j, 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 disscpimental 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. 



Fio. 120. 



Stauria astraelformis E. and H. Silurian ; Gotlaml, Sweden. A, Transverse section parallel to upper 

 surface. B, Enlarged transverse 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. 



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



Acervularia Schweigg. Astraeiform or bushy colonies. Septa stout and 



