PLATE I 
Figs. 1-5. Brockocystis nodosarius sp. nov. The pectinirhomb on plates 
12-18 is seen in figures 1, 2, and 3; the last two of these figures show also the pec- 
tinirhomb on plates 1-5; in each figure the anal area is on the right, the two plates 
bordering on the left side of this area being included in the figure. Figures 1 
and 3 show traces of the brachioles. The pectinirhombs on plates 14-15 and 10- 
15 are shown by figure 4; the anal area is included in the lower left hand corner 
of the figure. The pyriform enlargement of the column, a short distance below 
its top, is shown in figure 5, presenting both a horizontal and a vertical section, 
indicating the origin of this enlargement from the coalescence of a number of 
columnals. All figures enlarged 2.7 diameters. From 2 miles west of Peebles, 
Ohio; Brassfield formation. 
Fig. 6. Coiled crinoid stem. From Brassfield formation, 1 mile northeast of 
Wilberforce, Ohio. For illustrations of separate columnals see plate II, figures 
5A, B, C. 
Fig. 7. Brockocystis tecumseth (Billings). Enlargements of the top of the 
column, due to coalescence of several of the columnals. Three lateral views, 
showing variation in outline; one specimen viewed from the top, showing area 
of articulation. Cataract formation; half a mile east of Ice Lake, on road from 
Gore Bay to Kagawong, on Manitoulin Island. Shown in contrast with similar 
enlargements of the column in Brockocystis nodosarius. 
Fig. 8. Eomyelodactylus rotundatus sp. nov. Coiled column, terminating 
at the center at the point where reversa of curvature took place. In by far the 
greater part of its length this column has been split in half, and only the split 
surface is seen, exposing the lumen. See plate II, figure 3, for a cross-section of 
this column. Brassfield formation; nearly 5 miles southeast of Xenia, Ohio. 
