174 Cincinnati Society of Natural History. 



number. Spiniform corallites present, but mainly to be detected 

 by microscopic sections. 



Obs. This and the next are closely allied. Dr. Nicholson 

 considers them the same, but the smaller form, the oblique open- 

 ings of the cells, the absence of maculae, and the different horizon 

 at which it occurs will mainly distinguish the present species from 

 that following. 



Formation and Locality: Lower Silurian, Cincinnati Group, 

 Cincinnati, O. 



i8. M. MEEKi, U. P. James. 



Chcetctes mecki, James. Proposed in the Palaeont., p. i, 1878. 



Alonticulipora meeki, James. The Palaeont., 35, 1881. 



M. gracilis, \2iX viceki, James. Nicholson, Genus Montic, 127, 

 1881. 



Amplexopora cingulata, Ul. Jour. Cin. Soc. N. Hist., V., 254, 

 1882. 



A. robusfa, Ul., Ibid, VL, 82, 1883. 



Corallum dendroid, free (?), generally branching irregularly, 

 often but once, and having in tiiese specimens a Y like form; the 

 branches from less than two lines to over six lines in di.imeter, often 

 hollow, compressed and filled with clay. Surface smooth, with 

 stellate maculae, very slightly or not at all raised above the surface. 

 Calices sub-equal, j^olygonal or sub circular, slightly larger in the 

 maculae. Walls thick, not spinous. 



Obs. The peculiar foim of the corallum seems to be a 

 distinguishing feature in this species, at least in some localities. 

 The lower end in perfect specimens seems to terminate in a point, 

 often curved round. This may be only a variety of the preceding 

 as Dr. Nicholson asserts, but its size and form will serve to dis- 

 tinguish it. One of us has a specimen with seven branches, which 

 is two and one-half inches high. 



Formation and Locality: Lower Silurian, Cincinnati Group, 

 Oxford, and different localities, in Warren and Clinton Counties, 

 Ohio. 



19. M. o'neallt, James. 



Monticulipora (^Pletcrotrypa) 0' ncalli, James. Nicholson, Genus 

 Montic, 118, 1881. 



Chcetctes (?) d'nealli, James. Cat. Foss. Cin. Gr. , 2, 1875. 



Chcetctes sigillaroides, Nicholson. Pal. Ohio, II., 203, 1875. 



Callopora sigillaroidea, Nich. Ulrich, Jour. Cin. S. Nat. Hist., 

 v., 252. 



