ANTHOZOA—TABULATA. 



95 



Twelve radial furrows, not always preserved in fossilization, mark 

 the orifices and between them are rows of spinules. 



In the Hamilton group of Canada and Michigan and in Devonic 

 beds of somewhat earlier age at the Falls of the Ohio. 



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Fig. 151. Striatoporaflexuosa (N. Y. Geol. Surv. ). 



XLIII. Tkachypora E. & H. 



Corallum consisting of branching cylindrical stems, which are 

 made up of polygonal corallites with very thick walls, and circular 

 calices, which are superficially far apart. Scattered mural pores, 



remote tabulae, and rows of spines 

 representing the septa, are charac- 

 teristic. Dev. 



122. T. ornata Rom. (Fig. 152.) 



Devonic. 



Stems 10 to :o mm. in diameter, 

 orifices circular or oval, generally 

 slightly elevated, irregularly dis- 

 persed, the interspaces wider than 

 the diameter of orifice, which is 

 about \y 2 mm. Granules and short 

 radial ridges surround the orifices. 



Common in the Hamilton group 

 of New York, also more rarely in 

 Canada and Michigan. 



123. T. elegantula Billings. 



Devonic. 



Stems 2 to 5 mm. in diameter, orifices in four rows, oval and 

 partly edged by an elevated rim. 



Hamilton group of Michigan and Canada. 



FlG. 152. Trachypora ornata ( = 

 T. limbata Hall) (Pal., N. Y.). 



