NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
57 
FLORIDINA REGULARIS, new species. 
Plate 14, fig. 7, 8. 
Description. —The zoarium incrusts shells and consists of one or two super¬ 
posed lamellae. The zooecia are distinct, separated by a furrow, little elongated, 
hexagonal, regular; the cryptocyst is smooth, somewhat concave, limited laterally 
by two convergent grooves which end at the opesiules. The apertura is orbicular 
and forms the distal part of the trifoliate opesium; the polypidian convexity is 
limited laterally by two linear opesiules. The ovicell is little salient and endo- 
zooecial. The onychocellarium is fusiform; its beak is very salient on the zooecial 
plane; its opesium is anterior. 
Measurements (maximum). 
Opesia 
ho = 0.15 mm. 
, lo = 0.12 mm. 
Zooecia 
[Z ,2 = 0.40 mm. 
[ lz = 0.35 mm. 
Affinities. —The marginal zooecia are elongated; the central zooecia are 
transverse. 
This species differs from Floridina antique Smitt, 1872, in its onychocellarium 
with salient beak of a different form. It differs from Floridina parvicella in its 
larger micrometric measurements. 
Occurrence. —Miocene (Duplin marl): Wilmington, North Carolina (common). 
Natural Well, 2 miles southwest of Magnolia, Duplin County, North Carolina (com¬ 
mon). Miocene (Yorktown formation): Yorktown, Virginia (rare). 
Holotype and paratype. —Cat. Nos. 68475, 68476, U.S.N.M. 
FLORIDINA PARVICELLA, new species. 
Plate 31, fig. 12. 
Description. —The zoarium incrusts oysters. The zooecia are small, hexagonal, 
little elongated, distinct but with adjacent mural rims; the opesium is trifoliate; 
the anterior part of aperture is elongate or elliptical; the polypidian convexity is 
wide and limits two linear and transverse opesiules. 
Measurements .—Opesia 
ho = 0.10 mm. 
lo = 0.07 mm. 
Zooecia 
\Lz = 0.38 mm. 
1 Iz = 0.30 mm. 
Affinities. —This species is sufficiently characterized by its small dimensions. 
It differs again from Floridina regularis in the absence of a furrow separating the 
zooecia. 
The genus Floridina has been observed in the Cretaceous formations of north¬ 
ern Europe. It has, therefore, in the course of the geologic ages migrated slowly 
toward the Equator. The Waccamaw marl is its last known stage in America. 
Occurrence. —Pliocene (Waccamaw marl): Waccamaw River, Horry County, 
South Carolina (very rare). 
Holotype.—Cat. No. 68477, U.S.N.M. 
FLORIDINA MINIMA, new species. 
Plate 14, fig. 6. 
Description. —The zoarium incrusts shells. The zooecia are distinct, separated 
by a furrow, very small, hexagonal or ogival; the mural rim is wide, convex, little 
salient, very finely granulated; the cryptocyst is of little depth, somewhat convex 
* 12184—23—Bull. 125-5 
