442 The Ohio Naturalist. [Vol. XII, No. 3, 



county. Here Dinorthis carleyi, Leptaena richmondensis, Dal- 

 manella jiigosa, and PlatystropJiia poiidcrosa are found in descend- 

 ing order. 



The typical exposure of the Arnheini bed is located on Straight 

 creek, about a mile south of Arnheim, and five miles northeast of 

 Georgetown, in Brown county: 



Strophomena concordensis near top of blue, nodular clay rock. . . .6 ft. 



Limestone interbcddecl with much clay 12 ft. 



Strongly wave-marked limestone. 



Limestone interbedded with clay 7 ft. 



Dinorthis carleyi rare. 



Thin limestones and clay, with Leptaena richmondensis and 



Rhynchotrenia den lata 6 in. 



Limestone and clay with Leptaena richmondensis 9 in. 



, Clay with layers of nodules 2 ft. 4 in. 



Thin limestone with Leptaena richmondensis abundant 2 in. 



Limestone and clay 5 ft. 



Platystrophia ponderosa abundant in limestone 8 in. 



Dalmanella jugosa var., abundant, largest specimens 22 milli- 

 meters wide, associated with Platystrophia ponderosa, rather 

 few 9 in. 



Poorly exposed 7 ft. 



Coarse grained, cross bedded limestone, with wave-marked 



layer five inches above the base 5 ft. 6 in. 



Limestone and clay interbedded , 7 ft. 6 in. 



Raftnesquina very aljundant 4 ft. 6 in. 



Limestone with bryozoans and other fossils 1 ft. 6 in. 



Mount Auburn top, consisting of clayey limestone with Platy- 

 strophia ponderosa rather abundant 3 ft. 9 in. 



Wave-marked limestone layer. 



At Eddies run, one mile east of the line between Brown and 



Adams counties, and about six miles west' of West Union, the 



following section is seen : 



Strophomena concordensis common in nodular clay rock 5 ft. 



Interval 18 ft. 6 in. 



Leptaena richmondensis rare 4 in. 



Interval .5 ft. 



Leptaena richmondensis abundant 1 ft. 



Interval 10 ft. 



Platystrophia ponderosa and Dalmanella jugosa var. associated 



in the same layers 1 ft. 



Half a mile east of Manchester, the Beasley fork pike to West 

 Union crosses Island creek, and a mile northward the Mount 

 Auburn bed is exposed. A quarter of a mile farther northward, 

 northwest of the home of A. H. Foster, Leptaena richmondensis is 

 exposed five feet above layers containing Dalmanella jugosa var. 

 and Platystrophia ponderosa. Strophomena concordensis occurs 

 farther up stream. 



About three miles south of Maysville, in Kentucky, the deep 

 cut at the highest point reached by the railroad exposes the 

 following section : 



