NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
215 
Affinities. — This species differs from V elumella plicata in its wrinkled poly- 
pidian convexity, in its non transverse opesium, and its linear opesiules. We have 
observed a normal zooecium replaced by a perforated calcified zooecium. 
Occurrence. — -Upper Jacksonian (Ocala limestone) : along Chipola River, east 
of Marianna, Florida (very rare). 
Holotype. — Cat. No. 63975, U.S.N.M. 
Genus DIPLOPHOLEOS Canu and Bassler, 1917. 
1917. Diplopholeos Canu and Bassler, Synopsis of American Early Tertiary Clieilostome 
Bryozoa, Bulletin 96, United States National Museum, p. 20. 
The retractor muscles of the polypide are attached in the median axis of the 
zooecium. The. lateral indentations are symmetrical and almost transformed into 
true opesiules. The onychocellaria are straight, their opesium is oval, with a 
denticulated poster; the mandible is bimembranous. The mural rim is not sep- 
arated from the cryptocyst. The zooecium is closed by an operculum attached to 
the ectocyst. The axis of rotation of the operculum is indicated by two opesial 
denticles. The zooecial opesia are dimorphous; one kind is elongated and the other 
transverse. 
Genotype. — Diplopholeos fusiforme Canu and Bassler, 1917. 
Range. — Jacksonian, Vicksburgian. 
This genus differs from Rectonychocella in its dimorphous opesia and its poly- 
pi dian convexity, which is constant, protruding, and accompanied by two nearly 
complete opesiules. We are ignorant of the reason for the opesial dimorphism 
often accompanying zooecial dimorphism. 
DIPLOPHOLEOS FUSIFORME Canu and Bassler, 1917. 
Plate 34, figs. 11-14. 
1917. Diplopholeos fusiforme Canu and Bassler, Synopsis of American Early Tertiary 
Clieilostome Bryozoa, Bulletin 96, United States National Museum, p. 26, pi. 3, fi<j. 2. 
The zoarium incrusts shells and pebbles. The zooecia are hexagonal a little 
elongated, separated by a narrow furrow or united among themselves by their mural 
rims; the cryptocyst is deep, concave, shorter than the opesium, finely granular; 
the polypidian convexity is protruding, wrinkled or granulated, denticulated on 
its opesial border; the lateral openings are deep, round, almost becoming true 
opesiules; the opesium is elongated, semilunate, finely crenulated. The ovicell is 
an inconspicuous distal convexity, sometimes limited by two lines of lateral suture. 
The onychocellarium is narrow, fusiform , somewhat larger than the zooecia; the 
opesium is median, oval, the point below, with a narrow and denticulated posterior; 
the terminal point projects above the distal zooecium, but is very fragile; the distal 
canal through alteration in fossilization fuses nearly always with the cryptocyst 
of the distal zooecium. The heteromorphic zooecia are a little smaller; their 
cryptocyst is longer than the opesium which then appears nearly transverse. The 
ancestrula is of the same form as the zooecium. 
