CORNIFEROUS PERIOD. 



273 



Characteristic Species. 

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

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



Figs. 445-451. 



A 



Polyps.— Fig. 445, Zaphrentis gigantea; 446, Z. Rafinesquii: 447, Phillipeastrea Verneuili 

 448,448 a, Cyathophyllum rugosum; 449, Favositea Goldfussi ; 450, Syriagopora 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 (C. magnificum B.) has a dia- 

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

 447, Phillipsastrea Verneuili E. & H. ; fig. 448, Cyathophyllum rugosum, 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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