J\^ew Fossils from Missouri. — Jioirleij. 219 
iilse, reminds one of that genus with its short arms given olf 
"by the free rays. In case the name Arisfocrinus should prove 
to be preoccupied our genus could be changed to Callairay- 
crinus. 
ALLAGECRINUS AMERICANUS. sp. nov. 
Fig. 3. Lateral view of the body. Fig. 4. Ventral a.sj)ect of the 
largest specimen in the collection, greatly magnified. Figs. 5 to 10, 
Other and smaller specimens vei-y greatly enlarged, showing additional 
features. 
Crinoid minute. Calj^x conical. Basals form a low rounded 
•Clip. Number unknown, as the suture lines are not risible 
under a hand glass. Radials tive, elongate, each with one or 
two distinct articular facets above for the attachment of arms. 
These scars directed upward but not noticeably outward. 
Arms unknown. The dome or ventral surface composed ap- 
parently of three single pieces, thoug'h the depressions around 
the vault suggest five. The left upper corner of one of the 
radials in several of the larger specimens meets the edge of 
^e adjacent radial below the right upper corner of that plate 
and at first sight suggests an accidental break, but this may 
represent the anal area of other Paleozoic crinoids. The larger 
specimens with this feature present have scars for the attach- 
ment of nine arms, while the smaller examples have but five 
facets. A few thin round joints of a column have been ob- 
served attached to some of the specimens, and small, round 
stems are common in the clay. Plates apparently smooth. 
Most of the specimens are highly calcified so that features are 
made out with diftlculty. The collection contains over three 
hundred specimens of all sizes, from tliose almost microscopic 
to those one-sixteenth by one-thirtieth of an inch, all posses- 
sing the vault in place. 
Obtained from the clay partings between the two lower 
dayers of the Lithf)graphic or Louisiana limestone at the base 
of the Kinderhook group, Louisiana, Mo. The discovery of 
these little crinoids was made while washing clay for small 
brachiopods. 
All the specimens collected correspond very closely with 
those figured by Dr. ('arpenter as the jMuiiig of A. (nisfiiii, but 
nothing like liis mature form has come under our observation 
and we are convinced that our larger specimens arc atlults. 
This little crinoid is especially interesting, both because it is 
