170 



PALiEONTOLOOY OF NEW-YOIIK. 



Fig. 2 a. The surface of this coral, natural size. 



Fig. 2 h. The interior of the shell, showing the extension of the coral over the edge of the 



valve. 

 Fig. 2 c. Profile showing the nodulose surface. 

 Fig. 2 d. An enlargement of the surface, showing form and arrangement of cells. 



Position and locality. In the shale of the group at Lockport. 



565. 3. CERAMOPORA FOLIACEA (Tj.i^O- 

 PL. XL E. Fig. 3 a, h, c. 



Frond thin, expanding, foliate or subpalmate ; openings of the cellules (where worn) oblong 

 oval, or (where not worn) acutely angular at the upper extremity, slightly raised above the 

 surface, distant from each other less than the longest diameter of the aperture, often unequally 

 distant. Surface marked by ramulose or foliate impressions, giving an ornamented appearance 

 to the frond. 



This species is more slender and delicate than either of the preceding, consisting of a thin 

 expanded crust marked by rather distant oblong cells. The thin calicle is usually worn down 

 so that the apertures appear oval, or nearly so, and its affinity with the preceding species is not 

 always so readily perceived. These foliated impressions appear to be produced by the cicatrizing 

 of a small elongated space, from which the cells radiate on two sides and one extremity, giving 

 an ornate appearance to the whole frond, but at the same time producing irregularity in the 

 arrangement of the cells. The cells penetrate the crust obliquely. 



Fig. 3 a. A portion of a frond, natural size. 



Fig. 3 b. The surface enlarged, showing form and arrangement of cells. 



Fig. 3 c. A portion of the surface enlarged, showing the foliate impressions and arrangement of 

 cells around them. 



Position and locality. In the calcareous layers in the lower part of the Niagara shale at 

 Lockport. 



566. 3. RHINOPORA TUBERCULOSA. 



Pl. XL E. Fig. 4 a, h, c. 



Coral lamellose, subpalmate ; surface asperate and tuberculous ; tubercles mostly destitute 

 of cells at the summits ; cells rising in pustules upon the surface, and opening by roundish 

 oval or tripetalous apertures. 



This coral grows in lamellose or explanate fronds, which are celluliferous on both sides. The 

 outer edges are thickened and celluliferous, and the entire surface on both sides is uniformly 

 tuberculous. The tubercles are usually smooth and solid at their summits, rarely celluliferous. 

 The cells rise to the surface in minute, irregular pustules ; and the aperture, where entire, 



