NORTH AMERICAN EARLY TERTIARY BRYOZOA. G67 
Occurrence • — Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles 
south of Jackson, Alabama (rare). 
Cotypes.— Cat. No. 65378, U.S.N.M. 
PROBOSCINA CLAVATIRAMOSA, new species. 
Plate 153, tigs. 1, 2. 
D escription . — The zoarium incrusts shells in multiserial claviform "branches . 
The tubes are scarcely distinct, cylindrical, arranged in quincunx 0.36 mm. apart. 
The peristome is thin, salient, orbicular. 
j Maximum width of zoarium 1.00 mm. 
Measurements. — • Length of tube 0.10 mm. 
| Diameter of peristome 0.10 mm. 
Affinities ■ — This species differs from Proboscina conveniens in its claviform 
branches, much narrowed at their base, and in the much more scattered arrange- 
ment of the peristomes. 
O ccurrence. — -Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles 
south of Jackson, Alabama (rare) ; near Claiborne, Monroe County, Alabama 
(rare) . 
Holotype. — Cat. No. 65379, U.S.N.M. 
PROBOSCINA LATOBREVIS, new species. 
Plate 118, figs. 10-12. 
Description ■ — The zoarium is biserial and incrusts shells and orbitoid forami- 
nifera in short and undulated branches. The tubes are distinct, wide and short , 
punctate, arranged alternately. The peristome is thin, salient orbicular, oblique. 
The branches commence with a very large zooecium. 
[ Maximum width of zoarium 0.70-0.80 mm. 
Measurements . — - Length of tube 0.60-0.80 mm. 
| Diameter of peristome 0.22-0.30 mm. 
Variations. — The tubes in the vicinity of the ancestrula have no constant mi- 
crometric measurements; the peristome increases gradually from O.lf to 0.22 mm.; 
the length of the tubes grows from 0.50 to 0.70 mm. Sometimes the branches are 
triserial; when two zooecia are adjacent their peristomes remain free. 
The phenomenon of rejuvenation is rather rare. Here the branches commence 
indeed in a single zooecium, but it is enormous when the ancestrula is very small. 
Occurrence. — Upper Jacksonian (Ocala limestone) : Old Factory about 14 - 
miles above Bainbridge, Georgia (rare). 
Vicksburgian (Marianna limestone) : Near Claiborne, Monroe County, Ala- 
bama (rare). 
Cotypes. — Cat. Nos. 65291, 65292, U.S.N.M. 
