NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
665 
Diameter of tube 036 mm. 
Maximum width of zoarium 0.60 mm. 
Measurements . — ■ Length of tube 0.60-0.90 mm. 
Diameter of peristome 0.16-0.24 mm. 
Length of peristomie 0.30-0.40 mm. 
Variations .- — This species is very peculiar and easy to determine by its small 
angle of divergence. The branches begin always with an isolated zooecium and each 
recommences a series analogous to that which issues from the ancestrula itself. We 
have thus successively: Zooecia 1, 2, 2, separated, bifurcation; 1, 2, 3, bifurcation; 
1, 2, 3, 4 (in transverse rows), bifurcation. The variations of this species are con- 
siderable, but invariably the angle of dicliotomization remains very small. 
Occurrence . — Middle Jacksonian: Near Lenuds Ferry, South Carolina (com- 
mon) ; Eutaw Springs, South Carolina (rare) ; Wilmington, North Carolina (com- 
mon). 
Cotypes. — Cat. No. 65289, U.S.N.M. 
PROBOSCINA SUBECHINATA, new species. 
Plate 152, figs. 1-2. 
Description . — The zoarium incrusts shells in claviform and triserial branches. 
The tubes are distinct, cylindrical, arched, wrinkled transversally, in quincunx or in 
transverse series. The peristome is thin, orbicular, oblique ; the peristomie is rather 
long and elevated to 45°. 
( Maximum width of zoarium 1.6 mm. 
Measurements . — - Length of tube 0.70-0.80 mm. 
[ Diameter of peristome 0.18 mm. 
Affinities . — The angle of divergence appears to be small. The zooecia arranged 
in transverse series are frequent; the peristomies are always free and isolated. 
In zoarial aspect this species much resembles Proboscina echinata Reuss, 1865. 
Unfortunately we are ignorant of the micrometric measurements of this species and 
no specimen is known in the European museums. Canu in 1909 believed it ought to 
be compared with Proboscina major Johnston, 1847, but this was only a suggestion. 
The specimens of Proboscina - major Johnston. 1847, collected in the Mediterranean, 
have a peristome somewhat wider than that of our American specimens of the 
present species. 
Occurrence . — Vieksburgian (Marianna limestone) : Near Claiborne, Monroe 
County, Alabama (rare) ; Salt Mountain 5 miles south of Jackson, Alabama (rare). 
liolotype. — Cat. No. 65375, U.S.N.M. 
PROBOSCINA EXIGUA, new species. 
• Plate 118, figs. 7-9. 
Description . — The zoarium is multiserial and incrusts shells in branches en- 
larged distallv. The tubes are small , distinct, cylindrical, arranged in quincunx or 
in transverse series. The peristome is thin, orbicular, salient. The branches are 
