WHITE. ] CARBONIFEROUS FOSSILS. 125 
Position and locality——The only known example of this species wag 
obtained by Professer Powell from the Lower Aubrey, or middle group 
of the Carboniferous series, at the confluence of Grand and Green rivers, 
Utah. 
Genus CYATHOCRINUS Miller. 
CYATHOCRINUS STILLATIVUS White. 
Plate 35, figs. 3 a, and b. 
Cyathocrinus stillativus White, May, 1880, Proc. U. 8. National Museum, vol. ii, p. 258 
Body below the upper border of the first radial pieces shallow basin- 
shaped, much wider than high, having a narrow, moderately deep, ab- 
rupt, five-sided depression at the middle of the base, at the bottom of 
which is the facet for the attachment of the column; composed of 18 
moderately thick and strong pieces, all of which, except the basals, are 
more or less tumid in their middle portion; some of them presenting 
an uneven, irregular surface, which, with the impressed sutures and 
more deeply impressed corners of the pieces, give the surface a rugose 
appearance; basal pieces very small, occupying the bottom of the depres- 
sion of the base, the greater part of each being covered by the first joint 
of the column; subradial pieces having their height and width about 
equal, four of them pentagonal, and one, that which is next below the 
first anal piece, hexagonal, there being no appreciable angle upon that 
side of any of them which adjoins the basal pieces; first radial pieces 
much larger than the subradials, wider than their full height, includ- 
ing the arm facet; the two adjacent to the anal pieces being very little 
if any narrower than the others; arm facets large, about one-third wider 
than high, their plane being nearly vertical, notched at their upper bor- 
der, and marked transversely by the double ridge or raised ine common 
to many of the Cyathocrinide; anal pieces three known, nearly equal in 
size, or the first a little larger than the others, each having a prominent 
tuburcle at the centre; first anal-piece five-sided, abutting against one 
subradial, two first radials, and two second anals; the two second anal 
pieces abut against the first anal, each other, and each against a first 
radial. 
Diameter of calyx, 14 millimeters; height of the same, 6 millimeters. 
This is the first and only species of true Cyathocrinus yet known to me 
that has been found in strata of the Upper Coal-measures; C. infleaus 
Geinitz and C. hemisphericus Shumard not being regarded as species of 
that genus, but are more nearly related to Hrisocrinus as shown in a 
following paragraph. Our species belongs to a type that is more char- 
acteristic of the Burlington limestone division of the Subcarboniferous 
than of any other division of the great Carboniferous series; and, 
together with the Rhodocrinus described on a following page, it shows 
the crinoidal fauna of the Upper Coal-measures to be more intimately 
alee to that of the Subcarboniferous than it has hitherto been thought 
0 be. 
Position and locality—Upper Coal-measures, “30 miles west of Hum- 
boldt, Kansas.” The type of this species is among the collection of the 
National Museum, but the record of the collector’s name has been de- 
Stroyed by accident. 
