CALYPTOCRINIDAE 
37 
name Eiicalyptocrinus splendidus which remained buried in his unpublished 
monograph until 1909, down to the date of Wachsmuth and Springer’s descrip- 
tion. Only two or three specimens have been found, all remarkably true to type, 
from which I am giving figures of a very mature and what may be a young indi- 
vidual. The depressed interbrachial partitions wholly lack the thickening and 
wide extension of those of E. milliganae ; instead they are narrow and knife- 
like, with a peculiar splitting or doubling at the extreme upper end — seen also 
in E. ventricosus. 
Horison and locality. Beech River formation, Niagaran ; Wayne and Decatur counties, 
Tennessee. 
Eucalyptocrinus milliganae Miller and Gurley 
Plate 8, figs. 6-8 
Eucalyptocrinus milliganae, Miller and Gurley, Bull. lo, Illinois St. Mus., 1896, p. 88, pi. 5, figs. 4-6. — 
Bassler, Bibliogr. Index, 1915, p. 505. 
This is one of the best defined species of the genus, but Miller and Gurley’s 
type specimens were imperfect and failed to show its most distinctive character, 
the wing-like projections of the interbrachial partitions, as is seen in the three 
specimens I have figured, especially fig. 6. These are selected out of a dozen or 
more crowns almost equally perfect, from a colony in the uppermost shale of 
the Beech River formation at Tuck’s Mill, which by their prominence gave to 
that bed the name Eiicalyptocrinus zone. These specimens vary greatly in size, 
from 20 to 50 mm. in height of crown, but without exception they have the pro- 
jecting partitions more or less indicated by which the species is readily distin- 
guished. This is modified by growth, being more pronounced in the older indi- 
viduals. Along with this character the turbinate calyx, broadly truncate at the 
base, and the smooth surface, are substantially as described, and the median 
swelling of the arms, narrowing to fine points above, is to be noted ; they do not 
fold over the tegmen or encroach upon it in any way, but the widening parti- 
tions curve over to a junction with the central parts, forming a broad, flat cir- 
cular roof, with all its plates well exposed. This is in marked contrast with 
E. ventricosus in which the exposed part of the tegmen is reduced to a small disk. 
Horizon and locality. Beech River formation. Eucalyptocrinus zone, Niagaran; Tuck’s 
Mill, Decatur County, Tennessee. 
Eucalyptocrinus ventricosus Wachsmuth and Springer 
Plate 8, figs, g-12 
Eucalyptocrinus ventricosus Wachsmuth and Springer, N. A. Grin. Cam., 1897, p. 341, pi. 83, figs, ii, 12. — 
Bassler, Bibliogr. Index, 1915, p. 507. 
The most abundant species in the Beech River formation, being found at 
almost all the localities throughout the Tennessee river area, but only at the 
Tuck’s mill beds have such finely preserved specimens been recovered as those 
