4 
AUG. F. FOERSTE 
the writer ever found which is worthy of any attention. A close 
discrimination of the calyx plates and of the fragments of columns 
suggests that the Brassfield sea contained an abundance of 
crinoidal life, representing many species. The trouble is not 
with the lack of abundance, but with the dismembered condition 
of this material. 
Under the term crinoidal material, fragments of cystids fre- 
quently are included. Pectinirhombs, such as exist among the 
Glyptocystidae, occur in considerable numbers at some localities. 
Starfish material is extremely rare. In a dismembered condition 
it probably could not be recognized as such. 
Fragments of calyces with a number of plates still in position 
occur occasionally in the soft blue clay forming the top of the 
Brassfield formation at the quarry northwest of the railroad 
station at Centerville, and at the equivalent horizon in the 
abandoned quarry at the Soldiers Home, west of Dayton, Ohio. 
In the area southeast of Byron, about 8 miles northwest of Xenia, 
Ohio, the weathered tpp of the Brassfield limestone not infre- 
quently retains the basal portions of crinoid calyces, but usually 
poorly preserved. Unfortunately the exposed rock surface is 
relatively small; otherwise this area might give promise of more 
crinoid material. 
In the southern part of Ohio, in Highland and Adams counties, 
Brockocystis nodosarius is represented by numerous fragments 
in the lower third of the Brassfield formation; fairly preserved 
thecae, however, were found only at one locality, about two 
miles west of Peebles. Two of the starfish described from this 
part of the state, on the following pages, were obtained near 
the top of this Brockocystis zone. 
In addition to the material from the Brassfield, there is de- 
scribed on the following pages Clidochirus ulrichi, the only 
crinoid found so far in the Dayton limestone. This limestone 
lies immediately above the Brassfield formation and is correlated 
with the Pentamerus limestone in the lower part of the Clinton 
formation of New York. A poorly preserved specimen of Bo- 
tryocrinus, from the Holophragma zone at the top of the Upper 
or Lilley member of the West Union formation at Hillsboro. 
