NEW CRINOID FAUNA 
291 
They belong chiefly to the genus Pisocrinus, the pea erinoid. 
This genus has not been reported before from the Silurian of 
Iowa but it is signiflcant that it is abundantly represented in the 
Silurian fauna of Gotland^ and also in the Silurian at St. Paul 
and] vicinity, Indiana.® It will be recalled that these are the 
only localities, except at Monticello, where Petalocrinus has 
been found. The finding of Petalocrinus and Pisocrinus together 
in Iowa is only what reasonably might have been expected. 
It is quite likely when this new material has been studied 
carefully and some comparisons have been made that other 
genera will be recognized and that some of them will include 
more than one species. The writer hopes to have ready for pub- 
lication soon a detailed description of the species represented in 
the new material. A photograph of some of the specimens found 
is appended to this paper but complete identification has not 
been attempted. 
PLATE XXXII. 
NEW CEINOIDS FROM MONTICEELO. 
Figures are JSfatural Size. 
Figs. 1-5. Several views of an oval, cask-shaped species. 
Fig. 6. Quite similar to numbers 1 to 5, but pyriform. 
Figs. 7-13. Side views of several individuals of the genus Pisocrinus. 
Pigs. 14, 15. Basal view of Pisocrinus sp. 
Pigs. 16-20. Cups of Pisocrinus sp., seen from above. 
Pigs. 21-23, 26, 27. Segments of a small stem. 
Pig. 24. Side view of a broad, bowl-shaped cup; probably Pisocrinus. 
Fig. 25, A small pentangular cup seen from above. 
Fig. 28. Petalocrinus miraHlis Weller. Ventral view of five arm- 
fans, from different individuals, arranged in a relation similar 
to that which they retained in life. 
Fig. 29. Four fans of Petalocrinus, ventral aspect, showing different 
sizes. 
Pig. 30. Three fans of Petalocrinus, dorsal aspect, showing the smooth 
surfaces. 
^P. A: Bather. The Crinoidea of Gotland. Part I, the Crinoidea Inadunata 
(1893), pp. 22-35. 
5c. s. Beachler, Amer. Geol., Vol. 7 (1891), p. 178. 
