ANTHOZOA—TETRACORALLA. 



7$ 



In the Niagara and Guelph beds of New York, Canada, Wiscon- 

 sin, etc. 



57. D. panicum (Rominger). Devonic. 



Large stems, about 10 mm. in diameter and multiplying by 



prolific calycinal gemmation. About a third of the tubes occupied 



by the rather vesiculo^e compound tabulae, 



the outer zone by the carinate septa. 



In the Hamilton beds of Michigan. 



58. D. arundinaceum (Billings). 



Devonic. 

 Differs from the preceding by the nar- 

 rower vesicular zone, and regular tabulae. 

 Septa not reaching center. Diameter of 

 tubes 6-10 mm. 

 In the Onondaga limestone of New York, Canada, etc. 



Fig. 117. Diplophyl- 

 lum ccespitosum (after 

 Lambe). 



XXV. Craspedophyllum Dybowsky. 



Heads of cylindrical corallites as in Eridophylliun, but without 

 the epithecal prolongations and with the inner wall open on one 

 side, rarely closed, not crossed by the carinated septa. Devonic. 



Fig. 118. Craspedophyllum archiaci. 



59. C. archiaci (Billings). (Fig. 118.) Devonic. 



Stems nearly or quite in contact, sometimes becoming prismatic 

 from crowding, diameter from 10 to 20 mm. Calices deep. Septa 

 of the first cycle joining the horseshoe-shaped inner wall. 



