Strophomena and Other Fossils 
71 
cordensis. Strophomena nutans occupies a later horizon and may 
be regarded as a direct derivative of the Strophomena concordensis. 
At Clarksville, in Clinton county, unquestionably one of the 
type localities, the range of Strophomena nutans begins 12 feet 
above the lower Hebertella insculpta horizon, in the Blanchester 
division of the Waynesville bed. 
Hebertella insculpta occurs at several horizons in Cincinnatian 
areas: at the base of the upper or Blanchester division of the 
Waynesville; from 25 to 40 feet higher, at the base of the Liberty 
bed; and at a third horizon, between 15 and 20 feet above the 
base of the Liberty. 
At the base of the Blanchester division, Hebertella insculpta 
is distributed throughout Ohio, from Eagle Creek, about 5 miles 
west of West Union, in Adams county, to the vicinity of Oxford, 
in the northwestern part of Butler county. At the base of the 
Liberty bed, it extends from Wyoming, in the southern part of 
Fleming county, Kentucky, throughout Ohio, to Madison, in 
Jefferson county, Indiana. At the third horizon, between 15 
and 20 feet above the base of the Liberty, it is known east of 
Weisburg, in the northwestern part of Dearborn county, and 1 
mile north of Brownsville, in Union county, Indiana. The 
vertical and geographical distribution of Herbertella insculpta 
in this lower part of the Liberty member requires further study. 
Two miles east of Cross Plains, in the southeastern corner of 
Pipley county, a few specimens of Hebertella insculpta occur near 
the base of the Dinorthis subquadrata zone, the latter being sepa- 
rated from the top of the main Hebertella insculpta horizon, 5 
feet thick, which occurs at the base of the Liberty, by an interval 
of 3| feet. 
The lower Hebertella insculpta horizon, at the base of the Blan- 
chester division of the Waynesville, introduces a new Richmond 
fauna. Here, or immediately above this horizon, Dinorthis 
carleyi makes its second appearance, and Catazyga headi comes in. 
Strophomena nutans and Strophomena neglecta make their 
first appearance usually between 7 and 12 feet above the lower 
Hebertella insculpta horizon. Strophomena vetusta-precursor usu- 
ally comes in later than the other two species, although commonly 
before the disappearance of Strophomena neglecta. Frequently 
Strophomena vetusta-precursor continues later than Strophomena 
