NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
521 
Occurrence. — Upper Jacksonian (Ocala limestone) : Chipola River, east of 
Marianna, Jackson County, Florida (rare). 
Cotypes. — Cat. No. 64169, U.S.N.M. 
Genus GEPHYROPHORA Busk, 1884. 
1884. Gephyrophora Busk, Report on the Polyzoa collected by H. M. S. Challenger, pt. 1, 
p. 67. 
The apertura bears a proximal rimule. The frontal is a tremocyst. 
Genotype. — Gephyrophora polymorpha Busk, 1884. 
Range. — Tongrian- — Recent. 
The known species of this genus are : 
Gephyrophora polymorpha Busk, 1884. Recent. 
Gephyrophora ( Tlippothoa ) fenestrata Smitt, 1872. Recent (Florida). 
Gephyrophora (Schizoporella) biturrita Hincks, 1884. Recent. 
Gephyrophora ( Eschara ) tuberosa Reuss, 1865. Rupelian. 
Gephyrophora (Schizoporella) tuberosa , var. angustata , Waters, 1887. Mio- 
cene. 
Levinsen thought that the ovicell was endozooecial. If this observation be 
confirmed the genus must be removed from this family. 
Genus TESSARADOMA Norman, 1868. 
1868. Tessaradoma Norman, Report 38th Meeting British Association Advancement of 
Science, p. 309. 
The apertura is provided with cardelles. The frontal is surrounded by areolae 
and covered by a pleurocyst. The spiramen opens at the level of the operculum. 
The operculum in opening closes the spiramen. 
Genotype. — Tessaradoma (Pustulopora) gracile Sars, 1850. 
Range. — Jacksonian — Recent. 
In spite of Jullien’s observations, the exact nature of the spiramen is still 
doubtful ; its place and its function are not yet elucidated. 
TESSARADOMA ORNATA, new species. 
Plate 67, fig. 1. 
Description.— The zoarium is free, compressed, formed of three longitudinal 
rows of zooecia and on one side only ; the dorsal is a tremocyst with sulci and gar- 
nished with a row of salient avicularia with semicircular mandible. The zooecia 
are distinct, elongated, gibbose: the frontal is convex, smooth, surrounded by areolae 
and ornamented with one or two simple, salient avicularia. The peristome is 
salient and bears two small lateral avicularia; the peristomice is orbicular; the 
peristomie is visible exteriorly, long and very oblique. The spiramen is a large pore 
placed quite distant from the peristomice. 
,, \hpe=0. 09 mm. 
M easurements. — 1 enstomice ■ , 1 . nr 
Yl.pe— 0.09 mm. 
Zooecia 
[£3=0.60-0.75 mm. 
\lz= 0.25 mm. 
