352 Some New Species of Fossils from the CincinnaH Group. 



Calamopora fibrosa (Gold FUSS.) 



This species was placed by Prof. McCoy in the genus Stenopora, 

 ^vhere it was left by the Canadian geologists. It is quite likely, that it 

 should be classed in the genus Montlculipora and this would seem to be 

 the opinion of Edwards and Haime, certain, it is, however, that it does 

 not belong to the genus Chetetes. And I have elsewhere shown, that 

 there are no Corals, found in the Cincinnati Group, belonging to the 

 genus Chetetes. It was described from specimens, obtained by Gold- 

 fuss, from this vicinity, and there does not appear to me to be any diffi- 

 culty in identifying it. But Prof Nicholson, after examining the cor- 

 als of this vicinity, says he can not find it. He finds, however, 3Ion- 

 ticxdipora ptdchella of Edwards and Haime, whicli is the same fossil, 

 that I have been labelling Stenopora fibrosa or Montlculipora fibrosa for the 

 past five years, and which is the same, that Billings and the other Ca- 

 nadian geologists have called /6ro.*a in Canada. This species is a com- 

 mon form in the Trenton limestone of Canada and in the Trenton lime- 

 stone of Minnesota and Wisconsin, and is distributed throughout the 

 rocks, that we now call the Cincinnati Group, which, in their lower 

 exposure, are the equivalent of the Trenton rocks, and in their upper 

 exposure are the equivalent of the Hudson River Group. The coral- 

 lum forms cylindrical or subcylindrical branches from less than one- 

 fourth of an inch to an inch and a half in diameter and is composed of 

 polygonal, thin-walled corallites. It may be readily distinguished 

 from all other corals, with the aid of a magnifier, by the well marked 

 groups, on the suiface, of larger siz.ed corallites. The same f )S;il in 

 palmate or lobate form is identified by Prof Nicholson as Montlculi- 

 pora mammulata of D, Orbigny, and the massive and hemispheric forms, 

 have long been known as lycoperdon of Say. Prof Nicholson has made 

 a species, suhpidchellus, which is distinguished from )i6rosa, only on the 

 ground, that a few small corallites form the center of each group of 

 large corallites. If this distinction is sufficient to found a species upon, 

 then two more species may be provided, for the palmate, massive and 

 hemispheric forms that are distinguished from the mammidata and ly- 

 coperdon by the same differences. Prof Nicholson has founded another 

 species, which he has called Chetetes attritus, upon no other ground, 

 that I can discover, than the fact, that there are small crystalline 

 prominences on the surfiice, at the junction of the corallites, on speci- 

 mens, that have the appearance to thenaked eye of being weather worn, 

 and that aj^pear more distinctly to be surface worn, with the aid of an 

 ordinary magnifier. 1 do not know why the small points of lime should 



