660 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Variations. — We have figured some zoarial variations, one of which lias a very 
remarkable triangular palm tree shape. The zoarium is quite often free and the 
basal lamella is smooth. The peristomie disappears sometimes; in which case 
the zoarium offers the aspect of C ellulipora. 
Occurrence. — Midwayan (Clayton limestone) : One mile west of Fort Gaines, 
Georgia (common) ; Luverne, Crenshaw County, Alabama (very rare). 
Cotypes.— Cat. No. 65252, U.S.N.M. 
PROBOSCINA RUGOSA, new species. 
Plate 116, figs. 8-9. 
Description. — The zoarium is biserial and incrusts shells and bryozoa. The 
tubes are cylindrical, arranged alternately and covered with large transverse and 
very salient wrinkles. The peristome is orbicular, thick, little salient. The 
branches commence with a single zooecium and terminate in two, three, or four 
nonalternated ones. There are some secondary branches which commence with two 
zooecia. 
I Maximum width of zoarium 0.40 mm. 
Measurements. — Length of tubes 0.80-0.90 mm. 
( Diameter of peristome 0.20 mm. 
Occurrence. — Middle Jacksonian: Eutaw Springs, South Carolina (rare). 
Ilolotype.— Cat. No. 65272, U.S.N.M. 
PROBOSCINA PROJECTA, new species. 
Plates 116, figs. 6-7. 
Description . — The zoarium is biserial and incrusts bryozoa, emitting branches 
at the principal points of curvature. The tubes are indistinct, arranged alternately, 
striated transversally. The peristome is thin, orbicular, oblique. The peristomie is 
very salient and oblique. The branches commence always with an isolated tube. 
M easurements . — - 
Maximum width of zoarium 
Length of tube 
Diameter of peristome 
Length of peristomie 
0.60 mm. 
1.40 mm. 
0.24-0.30 mm. 
0.30 mm. 
Affinities. — This species differs from Prosboscina gerrdnata in its larger peri- 
stome (more than 0.20 mm.) and in its larger peristomie. 
Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wilmington, North 
Carolina (rare). 
Upper Jacksonian (Ocala limestone) : West bank Sepulga River, Escambia 
County, Alabama (very rare). 
Holotype.— Cat. No. 65271, U.S.N.M. 
