82 



COELENTEEATA— ANTHOZOA 



PHYLUM II 



Duncanella Nich. Corallum top-shaped. Septa nearly all of uniform 

 length and size, forming a spurious columella in centre of the deep calice, 

 exsert at the base. Silurian ; North America. D, horealis Nich. 



Fetraia Münst. (Fig. 103). Turbinate or conical. Septa short, reaching 

 to the centre only at the base of the very deep calice. Columella absent. 

 Ordovician to Carboniferous. 



Folycoelia King (Fig. 104). Horn-shaped. Calice very deep; four prin- 

 cipal septa reach nearly to its centre, between which in each quadrant are 

 five shorter septa. Zechstein. 



Kanophyllum Dyb. Ordovician and Silurian. 



Fig. 102. 



Cyathaxonia 

 cornuMich. Car- 

 boniferous Lime- 

 stone ; Tournay, 

 Belgiiim. Cor- 

 allum with 

 fractured theca, 

 showing open in- 

 terseptal loculi. 



2/1. 



Fig. 103. 



Petraia radiata 

 Münster. Devonian; 

 Enkeberg, near 

 Brilon, i/i. a, Cor- 

 allum viewed from 

 the apex; b, Trans- 

 verse section below 

 the middle. 



Fig. 104. 



Folycoelia pro- 

 funda (Germ.). 

 Zech stein; 

 Gera. Vi(after 

 Roemer). 



Fig. 105. 



Falaeocydus porpita 

 (Linn.). Silurian; 

 Gotland. a, Top 

 View of calice ; h, 

 Profile, i/i- 



Fig. 106. 



Microcyclus dis- 

 cus Meek and 

 Worth. Hamil- 

 ton (Devonian) ; 

 North America. 

 i/j. a, Corallum 

 from below ; 

 b, from . above 

 (after Nicholson). 



. Family 2. Palaeocyclidae Dybowski. 



Coralla simple, discoidal or howl-shaped. Septa numerous, stout, approaching 

 radial symmetry in disposition. Tabulae and dissepiments waiiting. 



Palaeocyclus E. and H. (Fig. 105). Discoidal to depressed top-shaped, 

 with epitheca. Septa numerous, radially disposed, the larger ones reaching 

 to the centre. Silurian. Type, P. porpita (Linn.). 



Combophyllum, Baryphyllum E. and H. Devonian. 



Hadrophyllum E. and H. Cushion-shaped, with epitheca. Calice with 

 three septal fossula, that of the cardinal septum being the largest, Devonian; 

 Eifel and North America. 



Microcyclus Meek and Worth. (Fig. 106). Like the preceding, but with 

 only one septal fossula. Devonian ; North America. 



Family 3. Zaphrentidae Milne Edwards and Haime. 



turbinate, conical or cylindrical ; septa numerous, exhihiting 



Theca generally formed hy fusion of 



s not very ahundant in inter- 



Coralla simple, 

 distinct bilateral symmetry in arrangement. 

 septal ends. Tabulae completely 

 se 



Streptelasma Hall (Fig. 107). Turbinate, often curved. Septa numerous 



