^70 • The Amcricaii Geologist. May, i90o 
24 lamellae that reach the bottom of the deep cup. The 
stem-like base is flattened for attachment to some hard ob- 
ject. Rim of the calyx thin. This coral comes from the 
Lower Burlington limestone at Louisiana, Mo., in a very in- 
teresting but narrow coral zone. 
Zaphrentis capuiiformis (nov. sp.). 
Plate V, Figs. 67, and 68. Lateral and calix views of one of the types, 
natural size. 
Fig. 6g. Calix view of another specimen somewhat reduced, show- 
ing at the side a strong, sharp ridge. 
Fig. 70. Same specimen, side, inverted view, X Yz- 
Corallum simple with an acute base, slightly curved and 
expanding rapidly to the top. The diameter of the calix is 
equal to or greater than the height of the coral itself. 
A ridge or keel extends from the point of the base to the 
calix rim and sometimes another more or less distinct one 
extends down the shorter side of the coral. Without exami- 
ning the calix, this fossil looks strongly like a Capulus shell. 
The surface is smooth, save the annulations which are 
not strong. The calix is hardly deeper than half the depth 
of the coral and has about 30 lamellae that extend to the 
large elliptical central pit at the bottom. There are two 
well developed, lateral septal gaps. The calix rim is almost 
a true circle in some specimens while in others it is a little 
elliptical. The nearest ally of this little coral is Zaphrentis 
elliptica. 
It occurs in the 5th division of the Burlington limestone 
at Louisiana, Mo. 
Cyathaxonia winchelli (nov. sp.). 
Plate V, Fig. 71. Side view of a large corallum, natural size. 
Fig. 72. A smaller specimen, side view, natural size, with a part of 
the rim broken away. 
Fig. 73. Calix view of another specimen, natural size. 
Corallum simple, small, elongate horn shape or more or 
less twisted. 
Cup deep with about 36 ill defined lamallse. A long 
needle-shaped cone arises from the middle of the bottom of 
the cup. Onl}^ edges of the lamelhy are visible on the flat 
bottom of the calix. This coral is hardl)' acute at the base. 
