202 The Ohio Journal of Science [Vol. XVII, No. 6, 



Osgood formation. 



Represented here by soft limestones, partly thinbedded and interbedded 

 with thin clayey layers 4 ft. 



Dayton limestone. 



Whitish limestone, poorly exposed 7 ft. 6 in. 



Brassfield limestone. 



Only the top of this limestone is exposed, near the western end of the ditch. 



The name Euphemia dolomite is proposed here for that 

 horizon which Prosser, in his paper on The Classification of the 

 Niagaran Formations of Western Ohio (Journal of Geology, 

 1916, pp. 334-365) called the Mottled Zone. The type locahty 

 for the Euphemia dolomite is located at the quarry described by 

 Prosser as the Lewisburg Stone quarry. This quarry lies a mile 

 northwest of Lewisburg. Euphemia is located a half mile 

 north of Lewisburg and is a little nearer to the quarry, so that 

 this name is available for the Mottled zone. 



Calostylis has been identified hitherto only from one horizon 

 and area in American strata, namely, in the Waco limestone 

 member, in the lower third of the Alger formation of eastern 

 Kentucky, where Calostylis spongiosa, Foerste, is found. This 

 Alger formation corresponds stratigraphically with the so-called 

 Niagara shales of the various reports written by Prof. Edward 

 Orton for the former Ohio Geological Survey. There is no 

 evidence, however, that any equivalent of the Waco member is 

 to be found within 40 miles of the Ohio River, even in eastern 

 Kentucky. Apparently it is only the overlying part of the Alger 

 formation, consisting of the Estill clay, which extends into 

 southern Ohio. It has been assumed at times that the Alger 

 formation of eastern Kentucky and the adjacent parts of Ohio 

 correspond stratigraphically with the Osgood formation of 

 Indiana and the adjacent parts of Ohio, but this assumption 

 never has been verified. 



Calostylis denticidata, Kjerulf, the type of the genus, was 

 described from Wisby, on the island of Gotland, Sweden, where 

 it ranges for 18 miles along the shores of the Baltic. It occurs 

 also at Malmo, an island near Christiania, Norway. Judging 

 from the figures of this species presented by Lindstrom, the 

 central vesicular mass is not well developed in young specimens, 

 the septa apparently reaching the center. The tendency of the 

 proximal edges of the shorter septa to unite with the lateral 

 edge of one of the adjacent longer septa also is shown. Two 



