Description of Some ISFew SjJecies of Fossils. 93 



some small specimens of Bellerophon bilobatus were found within the 

 envelope of plates. 



Locality and Position. — From the Cincinnati Group at Covington, 

 K3^, at an elevation of about 275 feet above low water mark in the 

 Ohio river. Found bv Mr. H. Dickhaut and the author. 



TUBULIPORID^. 



Genus Callopora, Hall. 



Callopora cincinnatiensis, n. sp. (Plate IV,, figs. 8, 8a and %h.) 



Polyzoary growing, usually in solid, though sometimes hollow 

 branches, that do not bifurcate equallj^ but at variable distances send 

 off short spurs, and are digitate at their extremities. 



Cells very small, not contiguous, with the intertubular space thick, 

 and occupied b}' from one to three rows of subangular interstial tubuli ; 

 cell apertures circular, about eight occupj'ing the space of one line, and 

 are generally separated once and a half times their diameter. Surface 

 presenting no maculae nor regular tuberosities, but is sometimes raised 

 into low monticules, with no particular arrangement. 



In longitudinal sections, the tubules are seen to have somewhat 

 flexuous walls, and to be nearlv vertical in the middle of the polyzoary; 

 they then gradually bend outwards, so as to make an angle of forty- 

 five degrees with the surface. In the intercellular tubuli, the dia- 

 phragms aie quite numerous and close, while in the true tubes they 

 are few and remote. 



This species is the only recorded representative of the Genus Callo- 

 pora in the Lower Silurian. The genus is, however, well represented 

 in all the strata from the Niagara to the Coal Measures. There is no 

 form in the Cincinnati group with which C. cincinnatiensis could be 

 confounded, unless it be with a certain vai'iety of ChcBtetes fletcheri, in 

 which there are a great number of intertubular cells; they are readily 

 distinguished by the smaller and circular cell apertures in this species; 

 the cell mouths in C. fletcheri are angular, and the intertubular cells 

 are not so numerous; the growth in the two forms is also very difl^'erent. 



Locality and Position.— This is a very rai'e species,and but few speci- 

 mens of it have been found. The specimens examined were found by 

 Mr. Fred. Braun and the author, in the Cincinnati Group, at Cincinnati 

 O. 



Ch^tetes vexustus, n. sp. (Plate IV., figs. 7 and la.) 



Pol^'zoar}^ composed of large, hollow branches, bifurcating at variable 

 distances, and sometimes irregularly thickened; branches growing 

 from a broad expansion, which is covered on the lower side by a heavy 



