656 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
STOMATOPORA POL1GONA, new species. 
Plate 115, figs. 9-11. 
D escription. — The zoarium incrusts shells and orbitoid foraminifera on which 
it forms more or less regular polygons; the angle of dichotomization is very obtuse 
and close to 120°. The tubes are thin, cylindrical. The peristome is thick, round. 
little salient. 
, Diameter of tube 0.10-0.12 mm. 
Measurements. — ] Length of tube 0.56-0.60 mm. 
[ Diameter of peristome 0.10 mm. 
This very interesting species is easily recognized by its small polygonal zoaria. 
Occurrence. — Lower Jacksonian (Moodys marl): Jackson, Mississippi (rare). 
Middle Jacksonian: Wilmington, North Carolina (very common), Eutaw Springs 
(rare) , and near Lenuds Ferry, South Carolina (very rare) . 
Upper Jacksonian (Ocala limestone) : West bank Scpulga River, Escambia 
County, Alabama (rare) ; Old Factory about Ur miles above Bainbridge, Georgia 
(rare) ; and below Plant System Railroad Wharf, Bainbridge, Georgia (very 
rare). 
Vicksburgian (Marianna limestone) : One mile north of Monroeville, Ala- 
bama (very rare) ; and Salt Mountain, 5 miles south of Jackson, Alabama (rare). 
Cotypes. — Cat. No. 65277, U.S.N.M. 
STOMATOPORA MINUTA, new species. 
Plate 162, fig. 21. 
Description. — The zoarium incrusts orbitoid foraminifera. The tubes are 
cylindrical, small , smooth. The peristome is thin, salient, elliptical. 
I Diameter of tube 0.10 mm. 
Measurements . — Length of tube 0.20 mm. 
Diameter of peristome 0.10 mm. 
Occurrence. — Vicksburgian (Marianna limestone) : Murder Creek east of Cas- 
tlebury, Conecuh County, Alabama (very rare). 
Holotype. — Cat. No. 65475, U.S.N.M. 
STOMATOPORA EXCAVANS, new species. 
Plate 115, fig. 1. 
Description .- — The zoarium incrusts shells, in which it appears to excavate 
furrows. The tubes are club-shaped, very narrow behind and raised almost ver- 
tically at their extremity. The peristome is thin, oblique, orbicular, or elliptical. 
M easuremen ts . — 
Length of tubes 0.48-0.50 mm. 
Diameter of peristome 0.10-0.12 mm. 
Affinities. — This species differs from Stomatopora cornu , in which the tubes 
are also club-shaped, bt^ its smaller micrometric dimensions. 
