NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
153 
Group of CALLOPORA TENUIROSTRIS. 
CALLOPORA CUCULLATA, new species. 
Plate 14, fig. 1. 
Description. — The zoarium incrusts a species of Idmonea. The zooecia are 
elongated, distinct, elliptical; the mural rim is salient, fiat, granular, very thin at 
the top, enlarged below. The opesium is elliptical. The hyperstomial ovicell never 
closed by the opercular valve, globular, and salient, exhibits a frontal triangular 
area of greater or less size. The avicularia are interzooecial, dispersed over the 
zoarium, large, without pivot, and quite acuminate. 
Measurements. — Opesia 
Avicularia 
\ho= 0.20-0.21 mm. 
|Z<?=0.16 mm. 
|Z&u=0.30-0.36 mm. 
j Z<rrc=0.16 mm. 
Zooecia 
Ovicells 
[Z. a = 0.32—0.36 mm. 
tfe=0.20 mm. 
\hov= 0.14 mm. 
|Zuu=0.08 mm. 
Affinities. — The ovicell is formed of two calcareous lamellae; the interior 
lamella is formed of an olocyst identical with the olocyst of the mural rim ; the 
superior lamella is a cover like a hood but incomplete and leaves the triangular area 
referred to above. The size of this area is quite variable. 
In its ovicell this species resembles Callopora aurita Hindis, 1877, considerably, 
but it differs in its greater zooecial length, and its interzooecial avicularia are as 
long as the zooecia themselves. 
Callopora cucullata differs from C . tenuirostris Hindis. 1880. in the triangular 
area of its ovicell and in its smaller dimensions. 
Occurrence. — Lower Jacksonian: 3| miles southeast of Shell Bluff post office, 
Georgia (very rare). 
TIolotype. — Cat. No. 63849, U.S.N.M. 
CALLOPORA STIPATA, new species. 
Plate 4, fig. 1. 
Description. — The zoarium incrusts shells. The zooecia are elongated, distinct, 
separated by a deep furrow; the mural rim is flat, very finely striated, much 
enlarged at the base; the gymnocyst. is very small and inconstant; the opesium is 
oval, very finely denticulated. The ovicell is small, globular, smooth, salient. The 
interzooecial avicularia are large, very elongated, fusiform or elliptical with two 
lateral denticles. 
Measurements . — Opesium 
Avicularia 
Ae>=0.18 mm. 
lo=0.12> mm. 
Lav— 0.24—0.36 mm. 
lav— 0.12 mm. 
Zooecia 
Z;s=0.30-0.36 mm. 
|fe=0.18 mm. 
Affinities. — This species is very characteristic. The avicularia are grouped in 
distinct but irregular lines ; they appear to safeguard the zooecia which they often 
entirely surround. 
Occurrence. — Midwayan (Clayton limestone) : Well at Brundidge, Alabama 
(very rare). 
Holotype.— Cat. No. 63795. U.S.N.M. 
