NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
661 
PROBOSCINA GEMINATA, new species. 
Plate 120, figs. 1-3. 
Description. — The zoarium is biserial, and incrusts cyclostomatous bryozoa. The 
tubes are cylindrical, rarely distinct, arranged alternately, striated transversally. 
The peristome is round, horizontal, little oblique, very thick; the peristomie is very 
long, scarcely oblique. In the short branches, the tubes are not alternated ; the per- 
istomes are at the same height and appear geminate, but this phenomenon is rather 
rare. 
'Maximum width of zoarium 0.18 mm. 
Diameter of tube 0.24 mm. 
Measurements . — /Length of tube 1.00-1.40 mm. 
Diameter of peristome 0.20 mm. 
Length of peristomie 0.24—0.30 mm. 
Affinities. — This large species is quite close to Proboscina projecta, but differs 
from it in its peristome of smaller diameter (0.20 mm. instead of 0.24 mm.) and its 
peristomie a little shorter and much more erect. 
Occurrence. — Lower Jacksonian (Mooclys marl) : Jackson, Mississippi (rare). 
Middle Jacksonian (Castle Hayne, limestone) : Wilmington, North Carolina 
(rare). 
Cotypes.— Cat. No. 65278, U.S.N.M. 
PROBOSCINA ANCEPS, new species. 
Plate 120* figs. 4, 6. 
Description. — The zoarium is biserial and incrusts shells emitting sublinear 
branches. The tubes are indistinct, geminate, striated transversely. The peristome 
is orbicular, thick, little salient, irregularly fringed. The branches are often uni- 
serial. This species is provided with the largest peristome of all the American 
species. 
M easurements . — 
Maximum width of zoarium 
Length of tube 
Diameter of peristome 
0.40 mm. 
1.40 mm. 
0.30-0.34 mm. 
Occurrence . — Middle, Jacksonian (Castle Hayne limestone) : Wilmington, 
North Carolina (rare). 
Cotypes. — Cat- No- 65279, U.S.N.M. 
PROBOSCINA EXPATIATA, new species. 
Plate 120, figs. 9, 10. 
Description. — The zoarium is biserial and incrusts shells emitting wide branches 
which are not all dichotomous. The tubes arc very wide, little convex, depressed, 
irregular, as if expanded , short. The peristome is thick, orbicular, or elliptical, 
very little salient. 
