674 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
DIASTOPORA STRIATISEMOTA, new species. 
Measurements- 
Afjvnities- 
Plate 121, fig. 9. 
Description.- — The zoarium is formed of wide, expanded fronds. The tubes are 
indistinct at their base, cylindrical at their extremity, arranged in widespread 
quincunx, garnished with small thin and scattered striations. The peristome is 
thin, orbicular, oblique, or elliptical when it is horizontal; the peristomie is salient, 
oblique, erect. The basal lamella is smooth. 
Diameter of the peristome 0.10 mm. 
Distance between the peristomes 0.40-0.50 mm. 
Separation of the peristomes 0.40 mm. 
Length of the peristomie 0.12 mm. 
-This species differs from Diaper oecia rugosa , new species, by the 
transverse, little salient wrinkles and a lesser 
zooecial length. 
Occurrence. — Upper Jacksonian (Ocala 
limestone) : Chipola River, east of Marianna, 
Jackson County, Florida (very rare). 
Middle Jacksonian: Seventeen miles 
northeast of Hawkinsville, Georgia (rare). 
Holotype. — Cat. No. 65300, U.S.N.M. 
DIASTOPORA MAGNIPORA, new species. 
A *22 
Fig. 218. — Forma Spiropora Lamouroux, 
1821. 
A. Zoarium, of Spiropora tetragona 
Lamouroux, 1821. B. Longitudinal sec- 
tion, through half of zoarium of 
Spiropora richmondensis Vine, 1884. 
(After Gregory, 1896.) 
Plate 153, figs. 3, 4. 
Description . — The zoarium is formed of 
a unilamellar and flabellate frond. The 
tubes are enormous , wide, oval, distinct at 
their base, somewhat upward bent. The 
peristome is very thick, orbicular, or ellipti- 
cal, very salient; the peristomie is short, 
raised to 45°. 
Measurements . — ■ 
Diameter of the peristomes 0.20-0.24 mm. 
Diameter of the apertura 0.10-0.12 mm. 
Distance between the peristomes 0.70-0.80 mm. 
Separation of the peristomes 0.64 mm. 
Length of the peristomie 0.32 mm. 
Occurrence . — Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles 
south of Jackson, Alabama (very rare). 
Holotype . — Cat. No. 65380, U.S.N.M. 
Forma SPIROPORA Lamouroux, 1821. 
1821. Spiropora Lamouroux, Exposition Methodique des Polypiers, p. 47. 
The apertures of the zooecia open in regular annular or spiral lines. The 
zooecia are regularly cylindrical. 
