88 Cincinnati Society of Natural History. 
GASTROPODA. 
Cyclonema bilix-fluctuatum James. 
Cyclora pulcella Miller. 
CEPHALOPODA. 
Orthoceras mohri Miller. 
VERMES. 
Polygnathus wilsoni James. Prioniodus dychei James. 
CRUSTACEA. 
Aparchites oblongus Ulrich. Primitia cincinnatiensis (Miller). 
Ctenobolbina ciliata - hammelli (c) 
(Miller and Faber). 
POSITION UNCERTAIN. 
Dystactophycus mamillanum Miller and Dyer. 
The Richmond Group. 
The Richmond embraces the uppermost beds of the Cin- 
cinnati period. In Ohio and Indiana they form an irregular 
belt, surrounding Cincinnati at a distance of from thirty to 
fifty miles. The localities in these States most noted for 
their fossils are Lebanon (not in the immediate vicinity, how- 
ever), Freeport or Oregonia, Waynesville, Clarksville, Mor- 
row, Westboro, Blanchester, Camden, and Oxford in Ohio; 
Richmond, Weisburg, Versailles, and Madison in Indiana. 
The rocks are even-bedded limestones, usually dove-colored 
or grayish rather than bluish, from two to ten or more inches 
in thickness, with regular shale alternations, the limestone 
forming from one-fourth to one-half the whole mass. 
The Richmond has received but little careful, detailed 
study, not enough to establish the boundaries or lithological 
characters of the divisions. The indications are that there 
are three well marked divisions, which for the present are 
designated as lower, middle, and upper Richmond. The 
lower Richmond seems to be strongly developed on the 
eastern side of the Cincinnati uplift, where the middle is 
feebly developed and the upper probably not at all. The 
middle division is finely shown at Richmond, Indiana, and at 
other points on the western side of the uplift. On this same 
40 
