24 Cincinnati Society of Natural History. 
POTERIOCRINUS VERUS, Nl. Sp. 
Plate IV., Fig. 9, natural size. 
Species medium size; calyx obconoidal, expanding very grad- 
ually, as long as wide, and composed of smooth rounded plates ; 
sutures distinct; basals pentagonal, standing upright, nearly as 
high as wide; subradials hexagonal on the symmetrical side, about 
one-half larger than the basals and a little longer than wide; radi- 
als pentagonal, wider than high, a little smaller than the sub-radi- 
als, convex, truncated the entire width of the plates, with suture 
gaping ; there are five brachials in two rays and seven in the other 
in our specimen before a bifurcation is reached; these plates are 
nearly as long as wide, round externally, and very slightly con- 
stricted, and the sutures are gaping; the last one has very steep 
upper sloping sides for the arms; arms ten, long, composed of very 
long constricted plates with slanting gaping sutures ; proboscis long; 
our specimen shows five subquadrate plates where the arms are 
broken away, indicating that the proboscis extended nearly or 
quite to the ends of the arms. Column round, and articulating 
faces of the plates radiately furrowed. 
Found at Crawfordsville, Indiana, in the Keokuk Group, 
and now in the collection of Wm. F. E. Gurley. 
SCAPHIOCRINUS MANUS, 0. Sp. 
Flate LV., Fig. 13, azygous side, natural size. 
General form of calyx and arms having a fancied resemblance to 
a hand; calyx cup shaped, height about half the diameter at the 
top, plates convex and sunken at the angles of the sutures; basals 
hidden within a shallow depression surrounding the end of the col- 
umn; subradials hexagonal, except one on the azygous side which 
is truncated at the top and heptagonal; they are larger than the 
basals, and about half as large as the first radials; first radials 
pentagonal, one-half wider than high, convex at the upper part, 
truncated the entire width, and separated from the brachials exter- 
nally by a wider suture. There is only a single brachial in each 
ray, and it is rather larger than a first radial, pentagonal, con- 
stricted, angular, and supports on its upper sloping sides the free 
arms; the two arms on the left of the azygous plate and the one 

