94 
Aug. F. Foerste 
valve usually are obsolete; the shell attains a larger size and is 
thinner, the interior of the pedicel valve not being conspicuously 
thickened toward the margin; and the muscular area of the pedi- 
cel valve is radiately striate or flabellate. The anterior termina- 
tions of the lateral borders of the muscular area are not deflected 
strongly to the front, on each side of the median anterior gap, as 
in the case of Strophomena vetusta. 
Strophomena neglecta makes its appearance in the lower part 
of the Blanchester division of the Waynesville bed, either at the 
same time as Strophomena nutans, or a short distance above. 
The greatest vertical range is about 8 feet. At Owingsville, 
in Bath county, Kentucky, it occurs, associated with Stropho- 
mena vetusta-precursor, in a thin layer 12 feet below the Dinorthis 
suhquadrata horizon. At Wyoming, in the southern part of 
Fleming county, it occurs 9 feet below the Hebertella insculpta 
horizon, which forms the base of the Liberty member. At Con- 
cord, in Lewis county, Kentucky, Strophomena neglecta occurs 
15 feet below the Hebertella insculpta layer forming the base of 
the Liberty, and Strophomena vetusta-precursor comes in 4 feet 
above Strophomena neglecta. 
The most southern exposure of the lower Hebertella insculpta 
horizon, at the base of the Blanchester division of the Waynes- 
ville member, is located almost directly south of the mouth of 
Gordon Bun, along a road leading southward from Eagle Creek, 
about 5 miles west of West Union, in Adams county. Here Cata- 
zyga headi is abundant immediately above the lower Hebertella 
insculpta horizon. From this locality northwestward, Stropho- 
mena neglecta may be traced within the Blanchester division as far 
as the Narrows, east of the Pinnacles, and 4 miles southwest of 
Dayton, and then westward to the vicinity of Oxford, in the north- 
western corner of Butler county. From the northern edge of Union 
county, in Indiana, to the vicinity of Brookville, in Franklin coun- 
ty, Strophomena neglecta occurs above the upper Dinorthis carleyi 
horizon, in strata also regarded as unquestionably belonging to the 
Blanchester division, since the upper Dinorthis carleyi horizon, in 
Ohio, belongs to the lower Hebertella insculpta zone, or immedi- 
ately above. Strophomena neglecta is very common at Moores 
Hill, in Dearborn county. The most southern specimens occur 
north of Canaan, in the northern part of Jefferson county, 16 and 
19 feet below the upper Hebertella insculpta horizon, which is 
located at the base of the Liberty member. 
