PLATE III 
Fig. 1. Brockocystis lecumseth (Billings). Basal view of theca, showing 
large lumen at area of attachment, the pectinirhomb on plates 1-5, and the reticu- 
lated surface of the plates. For additional illustrations of the same specimen, 
see Bull. Sci. Lab. Denison Univ., vol. 17, pi. V., figs. 2A, B, C; the character- 
istic globular or pyriform aggregations of columnals of th’s species are figured 
on plate I of the present paper. From Manitoulin Island, east of Ice Lake, on 
the road from Gore Bay to Kagawong. 
Fig. 2. Undetermined crinoid. Basal part of calyx of some unknown crinoid, 
with five infrabasals. Top of Brassfield formation; southeast of Byron, Ohio. 
Fig. 3. A Platycrinid (?). Calyx and arms apparently belonging to the Platy- 
crinidae; however, the margins of the plates are not defined clearly enough for 
accurate determination. Fro r the soft clay at the top of the Brassfield formation 
at Centerville, Ohio. Platycrinus corporiculus liingueberg (Bull. Buffalo Soc. 
Nat. Sci., vol. 5, 1886, p. 12, pi. I, fig. 9) from the Rochester shale at Lockport, 
N. Y., is a somewhat similar dubious form. 
Fig. 4. Cyathocrinus (?) sp. Parts of a crinoid with very thick plates, possi- 
bly a Cyathocrinus . A, a radial followed by two costals, the axillary costal sup- 
porting two arm-branches, of which only the left one is well preserved. The 
latter has three distichals, and again only the left branch of the succeeding arm- 
branch is well preserved. B, top of column with 2 very thick infrabasals still 
attached, also one of the basals. From the soft clay at the top of the Brassfield 
formation, at the Centerville quarry, Ohio. In vol. 3, Bull. Sci. Lab. Denison 
Univ., on plate 8, figure 42 presents one of the radials of this species, and figure 
43 probably represents one of the basals. Figure 44 may be one of the axillary 
plates of the arm system. All of these earlier figured specimens were obtained 
from the soft clay at the top of the Brassfield formation, at Soldiers’ Home, west 
of Dayton, Ohio. 
