NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
103 
Occurrence. —Miocene (Yorktown formation): Yorktown and 3 miles southwest 
of Petersburg, Virginia (common). Miocene (Duplin marl): Wilmington, and other 
localities in North Carolina (common); Darlington, Muldrows Mills, 5 miles south 
of Maysville, and other localities, South Carolina (rare). Pliocene (Caloosahatchee 
marl): Shell Creek, De Soto County and Munroe County, Florida (common). 
Pleistocene: Simmons Bluff, Yonge’s Island, Charleston County, South Carolina 
(rare); Mount Hope, Panama Canal Zone (rare). Pleistocene or Recent: Vero, 
Florida (rare). 
Habitat. —Gulf of Mexico off Florida (21-56 meters), Tortugas (29 meters), 
Bermuda, St. Thomas, St. John, and perhaps at Malacca (Levinsen). 
Plesiotypes. —Cat. Nos. 68547-68553, U.S.N.M. 
STYLOPOMA PROJECTA, new species. 
Plate 45, fig. 6. 
Description. —Zoarium incrusting. Zooecia distinct, separated by a furrow, 
regularly oriented, sub-rectangular; frontal convex and garnished with numerous 
tremopores. Aperture small, transverse, with a small, narrow' rimule; rounded 
at its extremity; peristome thick, salient, smooth. A small oral avicularium with 
pointed and very salient beak is adjacent to the rimule and to the aperture. The 
ovicell is enormous, globular ornamented with tremapores; it hides the aperture. 
The interzooecial avicularium is large, convex, with rounded and somewhat enlarged 
beak. 
Measurements.- 
. , (k = 0.10mm. 
-Aperture! 7 A . 
r iia = 0.11mm. 
„ . \Lz = 0.50-0.55 mm. 
Zooeciajk _ 0>30 _ 0>40 mm . 
Affinities. —This species is very well characterized by its small oral avicularium 
arranged to the right or to the left of the rimule, an arrangement not observed in 
other known species. 
Occurrence. —Pleistocene: Mount Hope, Panama Canal Zone (rare). 
Plesiotype. —Cat. No. 68554, U.S.N.M. 
STYLOPOMA MAGNIPOROSA, new species, 
Plate 47, fig. 4. 
Description. —The zoarium is bilamellar. The zooecia are large, elongated, 
distinct, separated by a furrow, elliptical; the frontal is convex and perforated by 
large expanded tremopores. The apertura is elongated; the anter is orbicular and 
very large; the poster is formed by a small narrow rectilinear rimule; the peristome 
is thick, little salient, smooth. On each side of the apertura there are two triangular 
oblique avicularia with the beak directed toward the base. The ovicell is enormous, 
globular, placed on the distal zooecium, covering and hiding the aperture. 
„ , ' x \ha = 0.2Q mm. v . \Lz = 0.60-0.70 mm. 
Measurements. — Apertura 7 ni _ Zooecia 7 A __ 
r 1 ta=0.15 mm. [ lz = 0.45-0.50 mm. 
Affinities. —This species differs from Stylopoma isabelleana D’Orbigny in its 
large frontal tremopores and in the beak of the avicularia directed toward the base. 
We have observed a giant aperture corresponding probably to a special or abnormal 
mandible. 
Occurrence. —Miocene (Bowden horizon): Santo Domingo. 
‘ Holotype .—Cat. No. 68555, U.S.N.M. 
