144 Cincinnati Society of Natural History. 



frequently bifurcate at right angles as well as at all other angles. The 

 diameter of a branch is from 1-4 to 1-2 a line. The cells are usually- 

 arranged in longitudinal lines, though this arrangement does not ex- 

 clusivel}^ prevail. The cell mouths are elliptical and separated b}' non- 

 poriferous spaces. A limited space within the bifurcation of the 

 branches, and upon the lower side of the branches is farrowed and des- 

 titute of cell mouths. 



This species is distinguished from B. fruticosa hy the mode of 

 branching and b}' the shape of the cell mouths. The cells are also 

 much more numerous, in B. fruticosa^ than they are in this species. 



This species is from my own collection, and was found in the Trenton 

 Group, near Nashville, Tennessee. B. fruticosa was described from a 

 specimen which I collected in the Hudson River Group, at Cincinnati, 

 and at the time of its illustration and description transferred to Mr. C. 

 B. D3^er. Mr. U. P. James never saw the specimen, unless Mr. Dyer 

 has shown it to him since it was illustrated and described, and the de- 

 scription which Mr. James had written of a fossil under the name of 

 Helopora dendrina does not apply to B. fruticosa. 



BEMABK8 OJST THE TEEN TON LIMESTONE OF KEN- 

 TUCKY, WITH DESCBIPTIONS OF NEW FOSSILS 

 FBOM THAT FOBMATION AND THE KASKASKIA 

 {CHESTER) GROUP, SUB-CARBONIFEROUS. 



By A. G. Wetherby, A.M., 

 Professor of Geology, University of Cincinnati. 



No list of fossils collected from the heavy-bedded limestones along 

 the Kentucky river, in Mercer, Garrard, Jessamine and adjoining coun- 

 ties, has, up to this time, been published. Traveling south, on the 

 line of the C. S. R.R., we pass through many cuts exposing the typical, 

 blue, tliin-bedded Cincinnati limestones and shales, the last of these 

 cuts being that at Roger's Gap, about sixt}' miles directly south of this 

 cit3^ Here the broken countrj^ suddenly disappears, and we enter at 

 once upon the renowned blue grass region, justly celebrated for its 

 stock-raising advantages. 



No more striking change in topographical features can be found in 

 the State of Kentuck}^, than that which is here met. The numerous 

 ridges, hills and gullies which have characterized the route, all the dis- 

 tance from Cincinnati, give way at once to a comparatively level and 



