122 PALEONTOLOGY OF OHIO. 



Trilobitic remains is another marked feature. But very few species, 

 and not many individuals of a kind, have yet been observed. In some 

 localities, however, the Caleymene Niagarensis appears to be not uncom- 

 mon, but, as yet, it appears to be the only abundant species. 



aRAPTOLITID^. 



Genus INOCAULIS, Hall. 



(Pal. N. Y., Vol. II., 1852.) 



InOCAULIS BELLA (ll. Sp.). 



Plate 6, flg. 2. 



Frond small, diffusely branched, originating in a single stipe at the 

 base and spreading above ; branches narrow, and varying much in width, 

 the strongest not exceeding three hundredths of an inch, with frequent 

 projecting, prong-like processes rising from the sides ; bifurcations nu- 

 merous and at varying distances. Substance of the frond thin, carbon- 

 aceous ; the surface marked with longitudinal corrugations, irregularly 

 disposed on most parts and on sqme of the larger branches, terminating 

 at the upper end in a pustule or free point, projecting outward and up- 

 ward from the surface. 



The only specimen of the species examined is a beautiful, small frond, 

 measuring about two inches across transversely, with a height less 

 than the width. The mode of growth and style of branching is similar 

 to that of I. plumosa, of the Niagara group of New York ; but the surface 

 does not present quite the regularity of leaf-like projections seen on that 

 species, the corrugations showing more like the surface markings seen 

 on some species of Dictyonema, although the mode of growth and the 

 entire absence of connecting filaments between the branches at once 

 distinguish it from species of that genus. 



Formation and locality: The specimen occurs on the shaly surface of a fragment 

 from a band of blue limestone in the Niagara group, at Yellow Springs, Ohio, and 

 is from the collection of Prof. Edward Orton. 



