150 



Cincinnati Society of Natural History. 



Family Theonoidce, Busk. 



Scenelloiiora, Ulricli. — Zoarinm broad, obconical, with the cell 

 apertures occupying the summits of ridges which radiate from the 

 sub-solid and depressed center of the flattened upper surface. Trenton. 



Family Entalophoridai, Reuss. 



Mitoclema, Ulrich. (compare Spiropora, Blv. ) — Zoarium ramose, 

 slender. Cell mouths more or less prominent, and arranged in trans- 

 verse series around the branches, or irregularly spiral. Trenton. 



Family Fenestellidat, King. 



Fenestella, Lonsdale. — Zoarium flabellate or infundibuliform. Cells 

 only on one side of the branches, in two rows, one on each side of a 

 median ridge. Dissepiments without cells. Cincinnati group to Car- 

 boniferous. 



Polypora, McCo}^. — Zoarium like that of Fenestella, from which it 

 differs in wanting a median ridge, and in having from three to five 

 rows of cells. Upper Silurian to Permian. 



Septopora, Prout. — Like Fenestella, but the dissepiments cany 

 cells. Subcarboniferous. 



Fenestralia^ Prout. — Like Fenestella, from which it differs in having 

 two rows of cells on each side of the median ridge. Sub-carboniferous. 



Phyllopora, King. — Zoarium, infundibuliform, composed of anasto- 

 mosing branches ; meshes rounded ; branches with two or more rows of 

 cells on one side, finely striated on the other. Trenton to Devonian. 



Archimedis, Lesueur. — Zoarium consisting of a spirally turned^ 

 solid axis, from which, at regular intervals, numerous infundibuliform 

 expansions are thrown out. These expansions have an upward direc- 

 tion, and when separated from the axis, they are indistinguishable 

 from those. of Fenestella. Sub-carboniferous. 



Lyropora, Hall. — Zoarium consisting of two strong diverging prongs, 

 between which is spread a reticulated expansion, the branches of 

 which carry from three to five rows of cells. Dissepiments strong, 

 without cells. Fenestrules, small, ovate. Subcarboniferous. 



Carinopora, Nicholson, Cryptopora, Nich., Ptilopora, McCoy. — 

 Not examined. 



Family Acanthocladidai, Zittel. 



Penniretepora, D'Orb. (Glanconome, Lonsd.) — Zoarium very 

 slender; branches, few, springing from the main stem at almost aright 

 angle. Celluliferous face of both main stem and branches, carrying 



