324 



PALEONTOLOGY OF NEW-yORK. 



515. 1. FAVOSITES NIAGARENSIS 1 



Pl. LXXm. Fig. lo-e. 

 See page 125, plate 31 A of this volume. 

 In all the specimens of this coral from the Coralline limestone, which I have examined, I am 

 unable to discover any character by which to distinguish it from the Niagara species. The size 

 of the columns, though extremely variable, is less than in F. gotklandica. The dissepiments 

 are often partially or entirely removed, and the space between them unequal ; and we may 

 add to this, that all the specimens are either solid and crystalline, or have the interior lined 

 Avilh crystals, so that the more minute structure is not visible. The solid specimens furnish 

 very beautiful polished surfaces, and many of them have been distributed to collectors by the 

 Messrs. Gebhard of Schoharie. 



Fig. 1 a. A fragment of stone, showing one mass in its natural position, while the other is re- 

 versed. This condition, in numerous instances, proves that they were not all covered 

 by sediment in the position in which they grew, but have been to some e.xtent trans- 

 ported. 



Fig. 1 6. A surface showing the ends of the columns. 



Fig. 1 c. A broken surface, showing the cellular structure : the walls and dissepiments are co- 

 vered by fine quartz crystals. 



Fig. 1 d. A small mass of this species. 



Fig. 1 e. A polished surface of another smaller specimen. 



Many hundreds of these corals, of a nearly spherical form, may be seen where the diameter 

 scarcely exceeds an inch, and in many instances they are of much less size. This species, with 

 the Stromatopora concentrica, are far more abundant than all the other corals of the rock. 

 These together often form almost the entire mass for a considerable thickness, there being just 

 enough sedimentary matter to cement the corals : the worn and weathered surfaces present 

 the masses in all possible positions, and consequently afford sections in every direction. 



Position and locality. The specimens figured were all found in the Coralline limestone at 



Schoharie. (^Collection of John Gebhard junior.) 



681. 2. STROMATOPORA CONSTELLATA. 



PL. LXXII. Fig. 2 a, b. 

 Compare Stromatopora polymorpha of Goldpuss. 

 Massive, hemispheric, spheroidal or irregular ; composed of thin concentric layers, which 

 are penetrated by minute vertical tubes or cells ; surface of layers nodose, each elevation being 

 marked by an irregular stellate impression with undulating and bifurcating rays; intermediate 

 spaces smooth, or having only the minute cell apertures. 



This species presents no important characters to distinguish it from the S. concentrica, ex- 

 cept the uneven surface 8i the laminaj, and the stellate impressions upon these elevations. The 



