88 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
sider this species as an easily recognized, characteristic fossil. Unfortunately, the 
species has not yet been discovered in many of the localities of the Midwavan. 
Occurrence. — Midwavan (Clayton limestone) : Owl Creek, 2§ miles northeast 
of Ripley, Mississippi (common) ; Mabelvale, near Little Rock, Arkansas (very 
rare) . 
Cotypes.— Cat. No. 63789, U.S.N.M. 
CONOPEUM WILCOXIANICUM, new species. 
Plate 9, figs. 1-7. 
Description. — The zoarium is incrusting, of one or more lamellae, or free and 
bilaminate. The zooecia are distinctly elongated, elliptical, or pyriform; the mural 
rim is flat, finely granulated, proximally widened. The opesium is anterior, ellip- 
tical or pyriform, entire or denticulated. The interopesial cavities are distinct, 
lozenge shaped. There are two distal impressions. 
Measurements. — Opesia 
(^o=0.26-0.30 mm. 
Xlo— 0.20mm. 
ZooeciJ^= 0 „ 40 -°- 44mm - 
Its =0.36 mm. 
Affinities. — This species differs from C onopeum hooclceri in the absence of the 
gymnocyst, from O. concavum in its much larger interopesial cavities and from 
C . lacroixii in the width of its mural rim. It is rarely incrusting, while the three 
species mentioned are always so. Its zooecial length is likewise a little greater, and, 
furthermore, it does not corrode the substratum, as in O . hooclceri and C. concavum. 
Total regeneration occurs rather frequently and manifests itself by a collar border- 
ing the opesia. 
Occurrence . — Wilcoxian (Bashi formation) : Woods Bluff, Alabama (common). 
Cotypes. — Cat. No. 63831, U.S.N.M. 
CONOPEUM (?) SIMILIOR, new species. 
Plate 9, figs. 8, 9. 
Description . — The zoarium incrusts shells. The zooecia are distinct, elongated, 
elliptical, separated by a deep furrow; the mural rim is regular, finely granulated, 
almost flat, a little larger in its proximal portion. The opesium is elliptical, finely 
erenulated. The calcified zooecia have a linear orifice and a semilunar distal furrow. 
_ . f/ie>=0.30mm. r , . (Zs=0.40mm. 
Measurements— Opesium , 0 Zooecia 7 n or 
1 I7o=0.15-0.18 mm. [fo=0.30mm. 
Affinities. — This species resembles C onopeum lacroixii exactly in its zooecial 
form and in its calcified zooecia. but it differs in its smaller micrometric dimensions. 
The two specimens found do not bear interopesial cavities, and hence our doubt 
as to the generic reference. The species requires further examination. 
Occurrence.— Wilcoxian Bashi formation) : Woods Bluff, Alabama (rare). 
Cotypes. — Cat. No. 63832, U.S.N.M. 
