SECONDARY AND TERTIARY FORMATIONS OF NORTH AMERICA. 177 



crusting and composed of numerous layers. With similar cellules, and the many 

 layers, Ceriopora is dendroid or branched, cellules all round ; and Semimulticava is 

 free with cellules on only one side. 



R. cepularis, G. and H., Proc. Acad. Nat. Sci. Phila. 18G0, p. 367. Id., G. and H., 

 Jour. Acad. p. 401, pi. 69, figs. 33, 34, 35. 



Colony encrusting in large masses, forming very irregular tubercles or nodes ; com- 

 posed of a large number of layers of cellules superposed. Cells angular, crowded, 

 irregular, separated by prominent walls, sometimes with distinct depressed lines be- 

 tween them. 



Only one specimen. Timber Creek, N. J. Cretaceous. 



This is probably the largest species found in New Jersey. The colony described is 

 over 2| inches in one of its diameters. 



Earn. CRESCISIDjE. 

 Cellules and intermediate pores irregularly scattered. 



CRESCIS. 



Colony composed of compressed branches, cellules on both sides, placed back to 

 back, with a distinct germinal plate between them. Ends of branches showing nume- 

 rous germs of cellules. Numerous intermediate pores between the cellules. 



This genus differs from Heteropora in the branches being compressed with a ger- 

 minal plate, which is absent in that genus. From Semicrescis it can be distinguished 

 by the cellules being placed on both sides of the branches, and in not having one side 

 covered by an epithelial layer. 



C. labiata, n. s., fig. 69. — Colony in flattened branches of variable width. Cellules 

 on both sides, with generally a very marked germinal plate between the two layers. 

 Cellules broadly arcuate internally. Opening small, circular, usually bordered by a 

 small rim, often blended into the surrounding surface. Intermediate pores numerous, 

 scattered and of variable size, sometimes possessing distinct mouths, representations of 

 the cellular mouths in miniature. Scattered over the colony are found, without any 

 definite arrangement, numerous labiate processes, which may have been connected 

 with the reproductive functions. We can suggest no other use for them, and have 

 been unable to ascertain, by breaking specimens, what connection they had with the 

 subjacent cellules. The supposition that they were ovicells is the most probable one 

 that has occurred to us. This is sustained by the fact that in old colonies, where the 

 intermediate pores and even the mouths of the cellules themselves are closed by a 

 heavy deposit of calcareous matter, these cups are still open, as represented in one of 

 the figures. Worn surfaces show the intermediate pores very distinctly, and usually 



