ECHINODERMATA OF THE BRASSFIELD FORMATION 
9 
of the section: Cyathophyllum facetum, Brockocystis nodosarius, 
Hemitrypa ulrichi, Phaenopora multifida, Rhinopora verrucosa, 
Hehertella daytonensis, Hehertella fausta, Orthis fiahellites, Pla- 
tystrophia daytonensis, Leptaena rhomhoidalis, Plectambonites 
transver sails, Strophonella daytonensis, Illaenus ambiguus, and 
Phacops pulchellus. 
At the quarry directly north of Lawshe, Ohio, the strata 
equivalent to the cherty limestones listed above are underlaid 
by several thinner bedded limestone layers containing Platy- 
merella manniensis Foerste (Bull. Sci. Lab. Denison Univ., 
vol. 14, 1909, p. 70, pi. 1, figs. 1 A-D) and Plectambonites trans- 
versalis. So far, this is the only locality known in Ohio, Indiana, 
or Kentucky, at which Platymerella occurs. 
The geographical range of Brockocystis nodosarius is limited 
to the southern part of Ohio. No specimens have been found 
so far in the neighboring parts of Kentucky. It occurs at numer- 
ous localities in Adams and Highland counties, in Ohio, and has 
been found also at Sharpsville, in the southern angle of Clinton 
county. The most western locality at which it has been noted 
is the quarry in the creek bottom, a short distance east of Dan- 
ville. Eastward, its range appears limited only by the extent 
of the outcrops. 
An unknown Brassfield Lepadocystid 
Plate II, fig. 2 
Detached plates of some Lepadocystid are common within 
5 feet of the top of the Brassfield formation at the exposure along 
the electric railroad where it follows the Dayton and Troy pike, 
about a mile northwest of Cowlesville, in the southern part of 
Miami County. Many of these plates bear pectinirhombs, and 
occasionally one of them bears the double pectinirhomb charac- 
teristic of plate 15 in the genera Brockocystis and Lepadocystis. 
In some of the plates the halves of the pectinirhombs are broad 
but of small height; they lie near the margin of the plates; the 
inner margin of the pectinirhomb is gently concave, the outer 
margin consists of two sides meeting at a very obtuse angle at 
