740 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Horizon and Locality. — Niagara group; Perry Co., Tenn. 
Types in the Mineralogical Museum at Breslau, Germany. 
Remarks. — Roemer’s figures are misleading. The calyx is not symmet- 
rical, as he represented it, and the interbrachial pieces bend but slightly 
Gaz = 
inward, even at the four regular sides. Neither do we find the small plates 
at their sides, nor the linear ambulacral slits; the spaces between the upper 
ends of the interbrachial plates are occupied by several small pieces, which 
are probably covering plates of the ambulacra. He also fails to represent 
the costals; they are plainly seen in two of the four specimens in our collec- 
tion occupying the part which in Roemer’s figure appears as if constituting 
a projection of the radials. 
