I 40 



NORTH AMERICAN INDEX FOSSILS. 



80. C. rugosa (E. and H.) (Fig. 194, 2.) Ordovicic. 



Of the type of C. ramosa, but the monticules united into prom- 

 inent transverse ridges with zocecial apertures. 



Lorraine beds of the Cincinnati region. 



B& 



Fig. 194. 1, Callopora ramosa, X 1 '■> la i enlargement of surface 

 X * > 3> C. dalei, X I 5 3^> surface enlarged. (After Nicholson.) 



rugosa. 



8 1. C. elegantula Hall. (Fig. 195, a-b.) Siluric. 



Branches solid, extremities often hollow or cup-like, apertures 

 circular, the opercula with central perforation and radiating ridges. 



Niagara of New York, Ontario, Indiana, Illinois, etc. 





FlG. 195, a. Callopora elegantula with FlG. 195, b. Callopora elegantula, a 

 enlargements of surface and individual fragment much enlarged, 

 tubes. 



Order CRYPTOSTOMATA Vine. 



XLVIII. Phylloporina Ulrich. 



Irregularly anastomosing branches, with two to eight rows of 



apertures on one side, the other longitudinally striated ; tabulated 



interspaces, closed at the surface, generally present; acanthopores 



often present. Ord.-Sil. 



