Aug. F. Foerste 
318 
along the road passing the reservoir. In fine-grained limestone i 
about 10 feet below a massive contorted layer and 25 feet above : 
Benson creek, about a mile northwest of Bridgeport, along the 
road to Benson station. Along the railroad, about a mile west 
of Benson, associated with Hehertella frankfortensrs, and immed- 
iately underlying argillaceous, fine-grained limestone, ii feet 
thick. In the upper part of the Paris bed, on the C. H. Bowyer 
farm, northeast of Becknerville. At the top of the Paris bed or 
at the base of the Flanagan chert, at Flanagan, In the upper 
part of the Paris bed in the quarry in the northern part of Cyn- 
thiana. About 20 feet above the Ohio river, at Carnestown, 
Kentucky, in strata associated with Eridotrypa mutahilisy Erido- 
try pa trentonensis, Prasopora falesiy Prasopora simulatriXy Cal- 
lopora multitahulatay Dalmanella bassleriy Platystrophia sp., 
Plectamhonites sericeay and Zygospira recurvirostra. 
Hebertella frankfortensis, James. 
{Plate VII, Figs. II, A, B.) 
{Catalogue of the Lower Silurian Fossils, Cincinnati Group, hy U. P. James, iSfl; p. 10, nomen 
nudum). 
{Paleontology of Ohio, voL i, p. lOi, under Orthis borealis) 
Radiating plications usually simple, about 40 in number, 
occasionally increased by intercalation near the postero-lateral 
angles to forty-five. Hinge-line distinctly shorter than the greatest 
width of the shell; the latter is found either at or slightly anterior 
to the middle. Brachial valve almost evenly convex, the low, 
broad, median fold being almost imperceptible except when the 
shell is seen from the anterior side. The broad, shallow, median 
depression or sinus of the pedicel valve frequently is much more 
conspicuous, although in some specimens it scarcely amounts to 
more than a distinct flattening of the anterior part of the valve. 
This flattening usually does not extend nearer to the beak than 
one-third of the length of the shell. The hinge-area of the pedicel 
valve is slightly incurved, inclining outward, the beak rising dis- 
tinctly above the level of that of the brachial valve. The largest 
specimens attain a width of one inch. 
Compared with Hehertella borealis^ Billings, from St. Martinks 
Junction, near Montreal, Canada, the flattening of the median 
parts of the pedicel valve begin nearer the beak and the shallow 
i 
