7fi COELEXTERATA OX ID ARIA SUB-BRANCH n 



dissepiments sparingly developed in outer zone of corallum. 50-60 species 

 known, ranging from Silurian to Carboniferous. Maximum development in 

 Carboniferous. 



Amplexus, Sow. Simple, sub- cylindrical, or elongated turbinate. Calice 

 shallow, usually Avith septal fossulae. Septa moderately numerous, short, never 

 produced to centre. Tabulae highly developed, horizontal. Ordovician to 

 Carboniferous limestone. 



Aulacophyllum, E. and H. Turbinate. Septa numerous, extending to 

 centre. Cardinal septum in deep fossula ; adjacent septa pinnately developed. 

 Ordovician to Devonian. 



J/^o/;A/////////, E. and H. (Fig. 104). Turbinate. Cardinal septum in 

 largest of three fossula. Carboniferous limestone. 



Lophophyllum. E. and H. Carboniferous limestone. Anisophyllam, E. and 

 H. Ordovician to Devonian. Pycnophyllum, Lindstr. Ordovician and Silurian. 

 Apasmophyllum, Roem. Metriophi/llurn, E. and H. Thamnophyllum, Penecke. 

 Devonian. Peiitapliyllum, de Koninck. Carboniferous. 



Family 4. Cyathophyllidae. Milne-Ed\vards and Haime. 



Simple or composite corolla. Septa numerous, radially arranged ; the four prin- 

 cipal septa rarely distinguished by greater or smaller size. Tabulae and veswulai 

 tissue (dissepiments) abundant. 



Cyathophylhim, Goldf. (Figs. 115-117). Extremely variable in form, 

 sometimes simple, turbinate, or sub-cylindrical ; sometimes giving rise to 



FiO.118. 



l'!/iitlinplii/U.ii/n i-i/cx/iitdxii HI, Gull 1 1. 



Devonian; Gerolstein, Eifel. Natural Cyathophyllum hemgonv.m, Goldf. Devonian; Gerol- 



size. stein, Eifel. Natural size. 



bushy, fasciculate, or astraeiform colonies, where reproduction takes place by 

 calicinal or lateral gemmation. Septa very numerous, strictly radial in arrange- 

 ment, and often alternately long and short ; the longer septa extending to the 

 centre. Visceral chamber filled with numerous imperfectly developed tabulae : 

 vesicular dissepiments highly developed in peripheral portion. Nearly 100 

 species known, ranging .from Ordovician to Carboniferous limestone Maxi- 

 mum development in Devonian. 



