16 
AUG. F. FOERSTE 
the right posterior arm, and also with the left side of the first 
costal and the lower left side of the second costal belonging to 
the same arm; on the other side, this anal x plate is in contact 
with the right side of the radial and the lower right side of the 
first costal belonging to the left posterior arm. Each arm be- 
gins with the radial followed by two costals, except in the case 
of the right posterior arm where the presence of the '^radianal 
in its primitive position under the right posterior radial, resting 
on the basals’^ (Springer) produces the appearance of a radial 
followed by three costals. The distichals in each arm-branch 
number four, excepting in the case of the left branch of the left 
posterior arm, where only three distichals occur. Most of the 
subsequent branches expose six palmars, but the tips are in- 
folded and are not well exposed so that the number of palmars 
may equal seven or eight, or even may exceed that number. 
The arms all are closely adjoined laterally. 
Locality and position. In the clayey layers at the top of the 
Brassfield formation, in the large quarry half a mile northeast 
of the village of Centerville, Ohio. 
Remarks. This species is characterized by its elongate form. 
The sides of the calyx diverge at an angle of about 40 degrees 
as far as the axillary costals. The series of distichals are more 
nearly vertical, and, beyond the distichals, the series of palmars 
are incurved. The ratio of the length to the width of the entire 
crown is about 17 to 10. 
Figure 39 on plate 8, vol. 3, Bull. Sci. Lab. Denison Univer- 
sity, republished on plate 27 of vol. 7 of the Ohio Geological 
Survey in 1895, represents a specimen obtained in the soft clay 
at the top of the Brassfield formation, at the Centerville quarry. 
In the original publication it was described as Ichthyocrinus 
sp.; a fragment of the calyx. This reference to Ichthyocrinus 
is based solely upon the close lateral abutting of the arms, and 
the general aspect of the fragment. At the base of the frag- 
ment is an axillary costal, followed by two arm-branches, each 
with three distichals; this is followed by four arm-branches, the 
two median ones with five palmars, the right-hand branch with 
eleven palmars; beyond the palmars, branching takes place 
