114 



COELENTERATA— ANTHOZOA 



PHYLUM II 



Columnopora Nich. (Calapoecia Billings). Like the preceding, but with 

 numerous, short, well-marked septa. Mural pores large, disposed in vertical 

 rows between the septa. Ordovician. 



Fig. 17tl. 



Favosites polymorpha (Goldf.). Devonian; Eifel. A, Corallum, natural size. B, Corallites enlarged, two 

 of them broken open and showing tabulae. C and D, Transverse and longitudinal sections showing spinitbrni 

 septa and mural pores 0*). (C and D after Nicholson.) 



Emmonsia E. and H. Ordovician to Carboniferous. Nydopora Nich. 

 Ordovician (Trenton). SyriiigoUtes Hinde. Silurian (Niagara). 



^ 2j Pachypora Lind. (Fig. 177). Corallum branch- 



ing, composed of prismatic, polygonal corallites, 

 the walls of which are so thickened towards their 

 mouths by layers of stereoplasma that the calices 

 appear to have circular contours. Septa very 

 minute ; mural pores scanty, but often of large size. 

 Abundant in Silurian and Devonian. 



Trachypora E. and H. Dendroid with cylindrical 



stems. Corallites polygonal ; walls so thickened by 



layers of stereoplasma that the calices become round 



„ ll.^ f ''^'^'h find greatly contracted, and appear to be superficially 



Middle Devonian; Eifel. A, ., , nx i r ^ ■ ^ i 



Transverse section. B, Longi- Widely Separated. Mural pores few and irregularly 

 Mura\''pot^e?(X^- N^d^^^^^^ ''' distributed. Septa represented by rows of spines. 



Tabulae at remote intervals. Common in Devonian. 



Striatopora Hall (Fig. 178). Like the preceding, but with tubes con- 

 tracted by stereoplasma at a greater depth, so as to give the calices a 

 funnel-shaped appearance. Silurian and Devonian. 



Alveolites Lam. (Fig. 179). Corallum massive or 

 branching, composed of small, contiguous, compressed, 

 thin-walled corallites, with obliquely opening triangular 

 or semilunar calices. Septa very faint, represented 

 merely by ridges or rows of spinules, sometimes but 

 a single row present. Mural pores of large size, ir- 

 regularly distributed. Very common in Silurian and 

 Devonian. 



Cladopora Hall ; Coenites Eichw. Silurian and Devonian. 



Fleurodidyum Goldf. (Fig. 180). Corallum depressed, discoidal, circular 



Fi(i. 177. 



Pachypnra nirliolsoni 



Fig. 178. 



Striatopora flejiiosa Hall. 

 Silurian (Niagara) ; New 

 York. 



