128 GEOLOGICAL SURVEY OF THE TERRITORIES. 
the two corresponding second radials. The possession of an anal piece 
by these three forms, while it is at present the only known feature by 
which they are separable from Mrisocrinus proper, is, in my opinion, of 
subgeneric importance. I therefore propose Certocrinus* as the name of 
a subgenus under Hrisocrinus, which will include these three forms, and 
all similar ones which have the general characteristics of Hrisocrinus, 
with the addition of one anal piece. 
Position and locality.—Upper Coalmeasures; ‘‘30 miles west of Hum- 
boldt, Kans.” The type here described is among the collections of the 
National Museum, but the record of the name of the collector has been 
destroyed by accident. 
ERISOCRINUS (CERIOCRINUS) INFLEXUS Geinitz. 
Plate 34, figs. 9 a and b. 
Cyathocrinus inflecus Geinitz, 1866, Carb. und Dyas in Nebraska, p. 62. 
Scaphiocrinus? hemisphericus (Shumard sp.) Meek, 1872, U.S. Geol. Sur. Nebraska, p. 147. 
Scaphiocrinus carbonarius White, 1876 (not Meek & Worthen), Powell’s Rep. Geol. Uinta 
Mts., p. 89. 
Body basin-shaped below the upper border of the first radial pieces, 
its basal portion deeply impressed, at the bottom of which depression is 
the facet for the attachment of the column; basal pieces very small, 
entirely covered by the first joints of the column, and occupying the 
deep depression of the base; subradial pieces large, longer than wide, 
flexed deeply into the depression of the base and extending upward to 
about mid-height of the calyx at their upper angles; the one ‘which bears 
the first anal piece being a little longer than the others, and narrowly 
truneated at top; first anal piece small, and, in the example here de- 
scribed, nearly twice as high as wide, placed between the two posterior 
first radial pieces, its upper end projecting above them and between the 
corresponding second radials; first radial pieces not materially larger 
than the subradials, about twice as wide as high, differing but little 
from each other in size and shape. Surface apparently quite smooth. 
Height of calyx, 11 millimeters; diameter at top, 21 inillimeters. 
Only a single example, and that of the calyx only, is contained in the 
collections of the survey. It is, however, quite a perfect example, and 
its specific identity with the C. imflexus of Geinitz, and not with the 
Poteriocrinus hemisphericus of Shumard, is evident from the relative 
size and position of the basal and subradial pieces. 
This form, although not specifically identical, is strictly congeneric 
with the P. hemisphericus of Shumard, which, together with that species 
and Hrisocrinus planus, I have above referred to a separate subgenus, 
under the name Ceriocrinus. 
Position and locality —The example from which this deseription is 
drawn, and which is figured on plate 28, was obtained by Prot. J. W. 
Powell from the middle division of the great Carboniferous series, at 
the confluence of Grand and Green Rivers, Utah, where it is associated 
with Hrisocrinus typus and Hupachycrinus platybasis. 
Genus POTERIOCRINUS Miller. 
POTERIOCRINUS MONTANAENSIS Meek. 
Plate 33, fig. 6 a. 
Poteriocrinus montanaensis Meek, 1873, An. Rep. U. S. Geol. Sur. Terr. for 1872, p. ae 
The following is Mr. Meek’s brief description of this species: 
‘¢ A small species, with an elongate obconical body, composed of smooth 
* Knpiov; a cake of wax.: 
