46 
SMITHSONIAN INSTITUTION 
Genotype. Saccocrinus speciosns Hall. 
Distribution. Silurian. Devonian and Lower Carboniferous. America, Europe. 
One of the Gotlandian species, P. lacvis ( Ang. not Portlock) —P. minor Wachsmuth and 
Springer, Icon. Crin., pi. i8, fig. ii, dififers from the dominant type in a way that would lead 
toward this genus. The Carboniferous species before alluded to would be much more at home 
in this restricted company, and the larger genus will be better balanced and more consistent 
in its characters with such forms as the first one here recorded eliminated. 
Saccocrinus benedicti S. A. Miller 
Plate 10, figs. 6 -i i 
Saccocrinus benedicti, IMiller, 17th Ann. Rep. Indiana Dep. Geol., 1892, p. 283 (aclv. sheets, p. 29), pi. 5, 
fig. i.—Periechocrinus ornatus, Wachsmuth and Springer, N. A. Crin. Cam., 1897, pi. 51, fig. 7 (not 
pi. 50, figs. za,h). 
A strongly marked species, abundant at St. Paul and obtained in excellent 
preservation minus the arms. The contrast between it and P. tennesseensis 
figured on the same plate is most striking. There is a stout, ovoid calyx, with 
rather broad base, thick plates of which the surface varies from simple convex 
to rugose, nodose, and even perhaps stellate ornament. The arm-openings stand 
out boldly from the calyx at about the third TTBr, thus limiting the free arms 
to two to the ray; how they branch, if they do, beyond that is unknown. In this 
small number of arms the species differs widely from all others of the genus 
thus far known. The one specimen with stellate ornamentation, fig. 14, is prob- 
ably of a different species, but lacks too much in the arm region for definition. 
Horizon and locality. Laurel limestone, Niagaran ; St. Paul, Indiana. 
Saccocrinus cuspidatus new species 
Plate 10, fig. ij 
A form partaking more of the general shape of Perieehocriiius than the 
preceding, but with a less slender, far larger and more robust calyx; while the 
shorter cup-plates with their sharp cusps instead of folds differentiate it com- 
pletely, and the latter character from all other species otherwise associated. The 
arms apparently become free with the IIIBr, which would give an average of 
four to the ray, probably subject to variation. The specimen is from a higher 
formation than the others mentioned. 
Horizon and locality. Louisville limestone, Niagaran; Jefferson County, Kentucky. 
In the Laurel limestone at St. Paul, there is another large species, ill defined, described 
by IMiller and Gurley as Saccocrinus umbrosus, Bull. 6, Illinois St. Mus., 1895, p. 24, pi. 2, 
figs. 13, 14. 
Subfamily BATOCRININAE 
Tegmen broad, well dift'erentiated, plates large and heavy, forming a rigid 
roof; arms not branching beyond tbe cup; biserial ; first IBr usually quadrangu- 
lar. Silurian to Tower Carboniferous. 
