BUB-CLASS 1 



A NTHOZOA TETRACORA LLA 



between which ;iin I tli- thera vehicular endotheca is abundantly developed. 



Common in Carboniferous rocks. 



Sclnveiu.u- Astraeiforni storks composed of small prismatic 



cMrallites. Septa e\t remely numerous. very slender, extending to the centre. 

 Theca imperfectly developed. Visceral chamber filled with infundibulit'orm 

 tabular and vesicular tixiir. Silurian (X. ///////x, M'Cuy sp.) and Devonian. 

 I'lif/tfiji/ifitlimi, S/titii</<>ji////!/niii, E. and 11. Silurian and I )-\ oiiian. 

 .Irrmiltii-in, Srhweiuu. Astraeiform or bushy colonio. Septa stout and 

 numrrou-. S3T interior wall ifl present; taltidae are de\c]oped in the central 

 area, \\hile the perijdieral zone is filled with vesicular tissue. Silurian (. /. 

 >, Lin. sp.) and Devonian. 



f, E. and H. (Fig. 123). Astraeiform colonies, with indi- 



vidual corallites united l>y confluent septa, which are produced lieyond the 

 theca. and uhsciire the same. Interseptal loculi filled with vesicular endotheca. 

 I>e\oniaii and (arhoniferous. 



Sfniir/n, E. and H. (Fig. 124). Astraeiform or bushy composite coral la. 

 Septa \\ell developed; the four principal septa characterised by larger size, and 

 forming a complete cross in centre of each corallite. Silurian (Wenlock). 



Columnaria, Goklf. (Favistella, Hall). Astraeiform stocks, composed of 

 long, polygonal, thick- walled corallites. Septa radially arranged in two cycles, 

 alternately long and short, barely reaching the centre. Tabulae horizontal. 

 disposed at regular intervals apart, and stretching across the entire visceral 

 chamber. Dissepiments imperfectly developed or absent. Ordovician to 

 Devonian. 



Heterophyllia, M'Coy. Carboniferous. Battersbyia, E. and H. Devonian. 



Family 5. Cystiphyllidae. Milne-Edwards and Haiinc. 



Usually simple corolla. Septa very thin ; interseptal loculi filial /'//// 



or compact stereoplasma. Tabulae absent ; central 

 of visceral cJmmler either completely filled ivith vesicular 

 ( stereoplasma, or containing the same only in the 

 lower portions of chamber. Calcareous operculum sometimes 

 present. 



CystiphyUum, Lonsd. (Figs. 125, 126). Simple, very 

 rarely fofmTng bushy colonies. Calice deep; the entire 

 visceral chamber filled with vesicular tissue, which, as a 

 rule, wholly obliterates the numerous lineally directed 

 si -pi a. Silurian and Devonian. 



>'//vy///^/r>, M'Coy (Fig. 127). Usually simple coralla. 

 Septa well developed, alternately long and short, some- 

 times forminj^a pseudo-columella. Silurian to Carbon- 

 iferous. 



Goniophjmm, E. and H. (Fig. 128). Corallum simple, 

 in the form of a four-sided pyramid, and covered with 

 thick epithecal deposit. Calice deep; septa numerous, 

 thick and very short. Entire visceral chamber filled with 

 vesicular and stereoplasmic endotheca. Operculum com- 

 posed of four plates symmetrically paired. Silurian. 



Rhizophyllum, Lindst. Corallum simple, pyramidal, 



KK.. i _:,. 

 Cyitipkyll 



< >[ < .; 1 ,' l 1 ,'.. ll si j!.'' v "" ia " 





or hemispherical, 



