NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
95 
Genus TRYPOSTEGA Levinsen, 1909. 
(For description, see Bulletin 106, U. S. National Museum, p. 327.) 
TRYPOSTEGA VENUSTA Norman, 1864. 
Plate 16, fig. 1. 
1920. Trypostega venusta Canu and Bassler, Monograph North American Early Tertiary Bryozoa, 
Bulletin 106, U. S. National Museum, p. 330 p. 85, figs. 15, 16 (bibliography and descrip¬ 
tion.). 
The earliest appearance of this recent species in the Tertiary rocks of America 
is in the Vicksburgian of Mississippi and Alabama, where it is quite rare. The 
Miocene deposits of North Carolina have furnished a very few specimens which 
differ in no appreciable respect from the typical form. 
Occurrence. —Miocene: (Duplin marl) Wilmington, North Carolina (very rare). 
Miocene (Yorktown formation): 1 mile west of Fort Nonsense, Gloucester County, 
Virginia (rare). 
Geological distribution. —Miocene of Australia (Waters); Vicksburgian of the 
United States (Canu and Bassler). 
Habitat. —Eastern Atlantic: English Channel, Madeira, Azores, Cape Verde 
Islands. Pacific: Lifu, Loyalty Island, Torres Straits. China Sea, Tozar Bank 
(43 meters). Indian Ocean: Saya de Malha (46-202 meters); Mauritius; Wasin, 
British East Africa (162 meters). 
Plesiotype. —Cat. No. 68534, U.S.N.M. 
Family ESCHARELLIDAE, Levinsen, 1909. 
Group , SCHIZOPORELLAE Canu and Bassler, 1917. 
Genus SCHIZOPORELLA Hincks, 1880. 
As employed in our Monograph on the North American Early Tertiary Bryozoa, 
Schizoporella is retained for species showing no ovicell and which therefore can not 
be grouped in their proper place in the Schizoporellae. 
SCHIZOPORELLA MAGNIPOROSA, new species. 
Plate 45, figs. 1, 2. 
Description. —The zoarium incrusts sponges. The zooecia are distinct, sepa¬ 
rated by a furrow, irregularly hexagonal; the frontal is little convex, porous, per¬ 
forated by large, scattered tremopores. The apertura is formed of a semicircular 
anter and of a wide rounded rimule. Near the apertura there are one or two small 
setiform avicularia. 
,, . [7ia = 0.18 mm. 
JxLCCISUVCTYlCTitS• Apcrtlll S/i ^ q 
Zooecia 
\Lz = 0.65 mm. 
lz = 0.50-0.55 mm. 
Affinities. —Only the figured specimens have been found, and as they are incom¬ 
plete and bear no ovicell it is impossible as yet to classify the species generically. 
The presence of small, oral, vibraculoid avicularia seems to indicate that this species 
belongs in reality to the genus Mastigophora. 
The ancestrular zooecia are much smaller. The ancestrula bears a large ellip¬ 
tical aperture occupying almost all its frontal. 
