278 The American Geologist. November, i904. 
The lunular scar for the reception of the first costal on 
three of the radials and on the first costal for the reception of 
the second costal of two of the rays are less than half the 
width of the plates. Supported by the first anal plate which 
is hexagonal of equal width and length and lying above a 
truncate basal and between two radials and the tAvo costals, 
is the 'second anal of equal size and shape as the first and 
lying partly between the two costals. The surface of all 
plates is apparently smooth. 
The colunm was perhaps as wide as the underbasal rim 
and with a medium canal. Arms and ventral surface un- 
known. 
In the equal underbasals, the number of anal plates and 
the incorporation of two first costals in the calyx, this little 
crinoid seems to^ differ quite widely from Gissocrinus and, in 
fact, all other cyathocrinoids. Its nearest affinities, however, 
seem to be with the cyathocrinoids and the genus Gis'socrinus. 
Anomalous as the statement may seem, the two costals men- 
tioned in the description have every appearance of radials ex- 
cept as to location. 
The specimen came from the oolitic division of the CHnton group, 
three miles west of Louisiana, Mo. 
Glyptocrinus insperatus? var carinatus, n. van 
Plate XVI. Fig. 56. 
This little crinoid, imperfect as it is, lying half imbedded 
upon a slab, has the appearanlce of being congeneric with 
figs. 34, 35, 36 and possibly, co-specific, agreeing with the 
three in its long slender pinules and the character of its stem, 
but differing in the possession of strong- keel-like nodes on 
its basal plates. The portion of stem attached to the base is 
composed of thin, uniform, round rings. An inch away ev- 
ery third or fourth stem joint is broader than its fellows, as 
shown in the figure. Better specimens may show this form 
to be a good species. Of the body plates but little can be 
made out beyond the fact that there are five keeled basals and 
five larger radials with a central indistinct ridge, each. 
The portion of a larger stem lying among the anns is of a 
larger specimen and shows well the character of the assoc- 
iated columns. 
