62 
Aug. F. Foerste 
ren county ; the exposures along Reservoir Creek, north of Lebanon; 
opposite the Chautauqua grounds, east of the Miami River, at the 
southern edge of Montgomery county; and 2 miles south of Jack- 
son burg, in the northern part of Butler county. 
At Maysville, Kentucky, Strophomena concordensis occurs, 
associated with Dalmanella jugosa in a bluish limestone about 2 
feet thick. Lithologically, the rock resembles the base of the 
Waynesville member, rather than the chunky argillaceous rock 
seen farther northward. 
The most interesting section, however, is that at Concord, in 
the northern part of Lewis county, where Strophomena concor- 
densis is limited to a vertical range of 1 foot, Streptelasma canaden- 
sis and Columnaria alveolata occuring 5 feet above this level, and 
Streptelasma canadensis being found also feet below the Stropho- 
mena concordensis horizon. Nothing like this has been observed 
elsewhere and the section requires further study. 
About 2 miles north of Hazelwood, Ohio, northwest of the 
corner at which Butler, Warren, and Hamilton counties meet, 
and also 1 mile south of Pisgah,inthe same corner of Butler county, 
specimens of Strophomena occur, at the Strophomena concordensis 
horizon, which are comparatively flat and so little nasute anteriorly 
that they suggest Strophomena planumbona and the flatter forms 
of Strophomena elongata rather than Strophomena concordensis. 
In some of these specimens the anterior margin is evenly rounded. 
It should be noted, however, that they are not of full size, and 
that at a more advanced age they might have developed to a 
form more nearly resembling typical Strophomena concordensis. 
The largest specimens of the more quadratic type have a width 
of 26 mm. with a length of 19 mm., while the largest specimens 
of the elongata type have a width of 30 mm. with a length of 
20 mm. 
Strophomena concordensis represents a reintroduction of the 
Strophomena vicina type of shell. Its geographical range is 
limited to the area between Lewis county, in Kentucky, and the 
eastern part of Butler county, in Ohio. Here it occurs only at 
the very top of the Arnheim, in strata which perhaps had better 
be placed at the very base of the Waynesville member of the 
Richmond. It is not known from the Arnheim of the remainder 
of Kentucky, or from Indiana or Tennessee. It recurs in the 
Blanchester division of the Waynesville member in an almost 
