The Geology of Cincinnati. 85 
CEPHALOPODA. 
Gomphoceras cincinnatiense Orthoceras dyeri Miller. 
Miller. ss harperi Miller. 
Gomphoceras faberi Miller. 
VERMES. 
Walcottia cookana Miller and Dyer. 
CRUSTACEA. 
Ceratopsis oculifera (Hall). Elpe irregularis (Miller). 
Ceraurus milleranus Miller and  Lichas halli Foerste. 
Gurley. Placentula marginata Ulrich. 
Ctenobolbina duryi (Miller). Primitia centralis Ulrich. 
Elpe cincinnatiensis (Meek). Proetus parviusculus Hall. 
POSITION UNCERTAIN. 
Blastophycus diadematum Miller and Dyer. 
Bythotrephis ramulosa Miller. 
Licrophycus flabellum Miller and Dyer. 
Mt. Auburn or Platystrophia lynx Beds. 
These beds were selected by Prof. Orton to mark the divid- 
ing line between the Cincinnati beds proper and the Lebanon 
division, but their thickness is much greater than was proba- 
bly suspected. At Cincinnati but few localities have an alti- 
tude great enough to showthem. ‘The city water tanks on 
Price Hill rest on them; the higher parts of McMillan Street, 
on Clifton Heights, were cut through them. Over a con- 
siderable part of Mt. Auburn they formed the surface rock 
with numerous exposures before the growth of the city 
covered this beautiful hilltop with residences. The high - 
ridge extending from west of Price Hill north through West- 
wood shows these beds wherever cut into. They are finely 
exposed in Reservoir Creek, north of Lebanon, Ohio. ‘Their 
thickness is about twenty feet. The lower five to twelve feet 
contain an abundance of the large Orthid, Platystrophia lynx, 
known in common parlance as double-headed Dutchman; in 
the remainder this brachiopod is much less abundant, other- 
wise the fauna is much the same. The most characteristic 
bryozoa are the Celoclema oweni and a fine species of Homo- 
trypa as yet undescribed. The beds are mainly blue shale, 
though sometimes yellowish in exposure, with some rather 
a7. 
