164 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
RAMPHONOTUS LEVIS, new species. 
Plate 1, fig. 14. 
Description— The zoarium incrusts shells. The zooecia are distinct, elongated, 
pyriform, with a convex gymnocyst; the mural rim is thin, salient, a little enlarged 
at the base. The opesiiun is oval, anterior, entire. The median avicularium is 
small and projects very little. 
Measurements. — Opesia 
Ae>=0.36 mm. 
lo=0. 12 mm. 
Zooecia 
Lz= 0.35-0.40 mm. 
.fo=0.24 mm. 
Affinities.- — Calcified zooecia perforated by a large, round pore and ornamented 
with a distal crescent may be observed. There are also imperforated calcified 
zooecia. 
This species differs from R amphon otu,s baccatus in its smooth mural rim, and 
from Ramphonotus regularis in its small dimensions. 
Occurrence. — Lowest Eocene (Bryozoan bed at base of Aquia formation) : Up- 
per Marlboro, Maryland (very rare). 
Holotype. — Cat. No. 63776, U.S.N.M. 
RAMPHONOTUS SLOANI, new species. 
Plate 4, fig. 4. 
Description. — The zoarium incrusts shells. The zooecia are little distinct, 
joined laterally to one another; elongated, elliptical; the mural rim is wide, flat, 
very oblique, finely granulated. The opesium is elliptical, elongated, quite finely 
crenulated. The ovicell is hyperstomial, never closed by the opercular valve, globu- 
lar, very salient; it is ornamented in front by a triangular cicatrix. The avicu- 
larium is large, transverse, elliptical, with pivot, salient. 
Measurements. — Opesia' 
Ao=0.30-0.35 mm. 
lo= 0.20 mm. 
Zooecia 
Lz— 0.50 mm. 
7^=0.30-0.35 mm. 
Variations. — The ovicell takes the place of the large distal avicularia, accord- 
ing to the rule in the genus. The latter is replaced by two small avicularia with 
pivot placed in the interzooecial angles. 
Affinities. — This is the largest species of Ramphonotus found in our American 
formations. The micrometric dimensions and the size of its avicularium differen- 
tiate it clearly from the other species. 
We dedicate this fine new species to Mr. Earle Sloan, of Charleston, South 
Carolina, who has been of great assistance to us in securing specimens from various 
localities in his State. 
The only specimen found has been figured. 
Occurrence. — Midwavan (Clayton limestone) : Brundidge, Alabama (very rare). 
Holotype. — Cat. No. 63798, U.S.N.M. 
