CORNIFEROUS PERIOD. 



273 



Characteristic Species. 

 1. Radiates — (a.) Polyps. — Fig. 445, Zaphrentis gigantea, part of a large 

 specimen from the Falls of the Ohio, showing at top the radiate structure, ana 



Figs. 445-451. 



Polyps.— Fig. 445, Zaphrentis gigantea; 446, Z. Rafinesquii; 447, Phillipsastrea Vernenilij 

 448, 448 a, Caryophyllia rugosa; 449, Favosites Goldfussi ; 450, Syringopora Maclurii; 451, 

 Aulopora cornuta. 



the depression or fossette in the star on one side ; fig. 446, Zaph. Rafinesquii E. 

 & H., from the Falls of the Ohio, remarkable for the depth of the cell. Another 

 Cyathophylloid coral of the genus Ghonophyllum (0. magnificum B.) has a dia- 

 meter at top of six or seven inches . it is from Walpole, Canada West. Fig. 

 447, Pliillip>sastrea Verneuili E. & H. ; fig. 448, Caryophyllia rugosa, a fragment 

 from a large mass from the Falls of the Ohio ; 448 a, section of a cell, showing 

 the numerous and very thin rays ; fig. 449, Favosites Goldfussi D'Orb., from the 

 Falls of the Ohio, a fragment of a large specimen ; fig. 450, Syringopora Maclurii 

 B., from Canada West, a coral consisting of a cluster of small tubular cells ; 

 fig. 451, Aulopora cornuta B., from Canada. 



(b.) Acalephs. — No species are known, unless, as Agassiz has suggested, the 

 Favosites and related corals are of this class (p. 162). 



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