PLATE IV 
llemipalaeaster scliucherti sp. nov. Abactinal side of an almost entire speci- 
men, enlarged about 2.1 diameters. Before complete burial, the margin of the 
disc appears to have rotted away from the proximal parts of rays III and IV, and 
to have shrunk away from the latter. In collecting the specimen, the tip of ray 
V broke off, and the impression left by this ray in the top of the limestone is shown 
by figure VA; the actinal side of this tip is represented by figure VB. The 
lateral margins of this second figure are formed by the inframarginals; the 
other two rows of conspicuous plates are the adambulacrals. For comments 
on the remainder of the specimen see the descriptive material accompanying 
the diagrammatic indications on plate V. From the top layers in the quarry, 
5^ miles west of Hillsboro, Ohio, reached by going from Fairview cross-roads 
half a mile east, then three-quarters of a mile south, crossing the headwaters 
of a small stream to a quarry in the lower half of the Brassfield formation. 
