Missouri Palaeontology. — Rowley. 301 
MISSOURI PALAEONTOLOGY. 
By R. R. RowLBY, Louisiana, Mo. 
PLATE XXI. 
Cyathocrinus formosus, n. sp. 
Fig. I. Side view of the type, natural size. 
Calyx elongate conical ; underbasals five, large and occu- 
pying nearly a third of the hight of the calyx. Basals large, 
six- and seven-sided. Radials hardly as large as the under- 
basals, with a broad scar above to receive the first costal. Each 
upper sloping edge of the bifurcating second costal supports a 
series of three radials of a higher order. Here again the third 
plate is bifurcating and supporting a third order of radials. 
As the rays have lost little in width at this hight, it is prob- 
able they were much longer and bifurcated a number of times 
more. Just above the single large anal plate and inclosed by 
three other plates above is a round anal opening, apparently 
near the base of a short anal tube. 
The ornamentation of the body plates is low, sharp, radiat- 
ing ridges and little nodes, the striae being almost parallel. A 
slight ridge follows the free rays and this, with nodes, con- 
stitutes the ornamentation of the arms. 
An inch of stem is attached to the specimen, made up of 
alternate larger and smaller joints set with nodes, like circular- 
saw teeth. The central canal of the stem is strongly five-lobed. 
The underbasals of our specimen extend upward to some hight 
instead of being "spread out" or "with a slight upward curva- 
ture," per generic diagnosis, and again the basals are much 
larger than the radials, contrary to Wachsmuth and Springer. 
The type came from the top of the Lower Burlington limestone 
at Louisiana, Mo. 
Cryptoblastus melo O. & S. 
Fig. 2. A lateral view of a crushed specimen to which two or three 
segments of the column are attached. The first segment seen outside 
of the base is somewhat larger than the next, and completely covers 
the basal concavity. 
Fig. 3. A view of the anal ( ?) interradius of another specimen in 
which a large elliptical plate, nearly a third of the body in length, lies 
below the deltoid, thus giving two interradials to the area. This plate 
has a convex surface in strong contrast to the valley-like suture line 
of the radials. 
