156 Cincinnati Society of Natural History 



Description of Plate IV. 



Figs. lA-J — Colitmnaria alvcolata-interventa — All of the 

 specimens are from the Benson limestone at Stop 11, north of 

 Hulitt station, northeast of Brannon, on the electric railroad from 

 Lexington to Nicholasville. A, B, specimens which have weath- 

 ered so as to show the larger corallites as depressions surrounded 

 by smaller corallites. C, a similar specimen, showing the strongly 

 divergent corallites. D, G, show similar features in specimens 

 whose corallites do not attain the same size. In E the corallites 

 are more nearly of the same size. C, F, show the vertical wrink- 

 ling of the cell walls. D, E, show the strong septa, almost reach- 

 ing the center, although it is not well brought out by the photo- 

 engraving. H, J, basal views, with the lower surface of the coral- 

 lites flattened in the first case, as though appressed to a flat surface, 

 but semi-cylindrical in the second case, as though free from con- 

 tact. 



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