98 
THE SCIENTIST. 
visible on a side view. Radials. nearly 
twice as wide as high, bent inward below 
and rapidly expanding above, giving a 
very shallow calyx. Interradial plates, 
three, the central largest and hexagonal. 
Central anal plate, large, heptagonal, 
succeeded by a middle octagonal and 
two lateral liepragonal plates above. 
Vault, hemispherical, covered by large 
hexagonal and heptagonal plates. 
As the specimen described is a natural 
cast, the large furrows, converging from 
the arm openings, appear as prominent 
flattened ridgt s. The anal opening is at 
the end of a protuberance, directed out- 
ward, large, and on a line with the top 
of the vault. 
The specimen inverted looks not unlike 
a hand grasping an apple, the radiating 
ridges answering to the fingers, while the 
anal protuberance is the wrist. This 
resemblance is not so fanciful. 
The plate sutures are veiy distinct 
throughout the whole body. 
Col um nar attach me n t m ode ra tel y 1 arge, 
circular. 
Of this large and striking fossil but 
two natural casts have been found in the 
the Upper Burlington chert at Louisiana, 
Mo., the specimen figured having been 
collected a number of years ago by Mr. 
E. J. Haff'ner, now of Muncie, Ind. 
Platycrinus margin atus, n. sp. 
Plate IL Fig. 5, side view of the basal 
plates. 
The base of this peculiar Platycrinus 
is all that is known of the species, but 
the very extravagant, thin, rim -like ex- 
pansion about the columnar attachment 
is so striking as to lead us to found a 
species upon material we would other- 
wise consider insufficient. The Basal 
plates form alow, convex cup, without 
surface ornamentation. The expansion 
is extravagantly produced and very thin 
and fragile, indistinctly fluted and fur- 
rowed on the underside. 
Columnar attachment rather small and 
round. Columnar canal comparatively 
large. 
The specimen flgured was found in 
the Upper Burlington Limestone on 
Spencer creek, two miles north of Curry- 
ville, Pike County, Mo. 
Platycrinus insolens, n. sp. 
Plate 11. Fig. 4, side view of the calyx. 
Anal side. 
Calyx, cup-shaped, slightly broader 
than deep. Plates, moderately rhick; 
sutures,s]ight]y beveled; sinf:ice,\vith( ut 
ornamentation. BasaJs produced into an 
expanded rim below and without col- 
umnar excavation, sloping upward to 
meet the first radials; the latter being 
slightly convex and about as wide as 
long. The articulating facets for the 
second radials, a little more than half the 
width of the upper edges of the fir.-t 
radials, beautifully stiiate. Cohmm 
medium in Fize and round at its attach- 
ment to the base. 
The basal rim is fluted below and 
crumpled at the edge. 
Collected in the Chouteau Limestone, 
three miles south-east of Curry ville. Mo. 
Platycrinus curryvillensis. n. sp. 
Plate II. Fig. 5, side view of the calyx. 
Calyx, bowl-haped; width, nearly one 
and a half times the height. No notice- 
able beveling at the sutures. Surface, ap- 
parently smooth. Basals but slightly 
convex with a depressed rounded rim 
about the column base. Padials but 
little wider than high, expanding but 
little upward and prominent at the 
articulating facets which occupy less 
than one-half the width of the radials, 
Columnar attachment small. 
Collected in the Chouteau Limestone, 
three miles east of Cuiry ville. Mo. The 
