90 



ANTHOZOA. ZOANTHARIA 



columella,' which consists of vertical radiating plates crossed 

 obliquely by vesicular tabula? ; this structure forms a prominent 

 projection at the bottom of the calyx. The pseudo-columella is 

 surrounded by a zone formed of tabulae, and external to this is a 

 large zone of dissepiments. Carboniferous. Ex. C. bipartitum. 



Dibunophyllum. Like Clisiophyllum but with a strong 

 median vertical plate across the pseudo-columella. Carboniferous. 

 Ex. D. muirheadi. 



Cyclophyllum. (fig. 33.) Like Clisiophyllum but with 

 pseudo-columella surrounded by a distinct wall which is produced on 

 one side into an angular or tongue-like projection pointing towards 

 the fossula. Carboniferous. Ex. C. fungites. 



Fig. 34. Zaphrentis delanouei, Carboniferous Limestone. A, horizontal 

 section ; a, cardinal septum in fossula ; b, counter septum ; c, alar 

 septa ; d, counter-lateral septa bounding the counter fossula ; 

 e, alar fossula. B, vertical section showing tabulas bending down 

 into the cardinal fossula (a) ; b, counter side. x 5. Drawn by 

 R. G. Carruthers. 



Lonsdaleia. Similar to Clisiophyllum, but compound, and 

 the septa do not reach the wall of the corallite, the marginal part 

 being occupied by dissepiments only. Carboniferous. Ex. L. 

 duplicata. 



Cyathaxonia. Simple, turbinate or elongate-conical. Septa 

 reach the columella, which is solid. Fossula present. Tabula? 

 sometimes present. No dissepiments. Carboniferous. Ex. C. cornu. 



Zaphrentis. (fig. 34.) Simple, free, bilateral ; turbinate, 

 conical, or cylindrical, often curved ; calyx deep ; theca thick. A well- 



