Bulletin - United States National Museum - Smithsonian Institution

70 BULLETIN 96, UNITED STATES NATIONAL MUSEUM.
The apertiira presents on its straight proximal border a small
linear rimiile. The ovicell is recumbent and opens widely above the
apertiira. The frontal is a tremocyst. The peristomie is greatly
expanded and is interrupted in front by an immense incomplete
spiramen. The avicularium is vibraculoid.
Genotype.—Schizohathysella saccifera^ new species. Jacksonian.
This genus differs from MastlgoyKora only in the nature of the
peristome, which is much more salient and interrupted in front by
a pseudospiramen.
It differs from Gigantopora Ridley, provided also Avith a spiramen,
in the different form of the operculum and in its smooth frontal.
SCHIZOBATHYSELLA SACCIFERA, new species.
Plate 6, fig. 7.
Description.—The zoarium incrusts shells. The zocecia are distinct,
elongated, irregularly elliptical; the frontal is convex and
formed of a tremocyst with small pores. The apertura is semilunar
it bears on its straight proximal border a small linear rimule; the
peristome is much developed into two large lateral lips circimiscribing
a sort of incomplete and very large spiramen. The ovicell is
hyperstomial and recumbent: it forms a sort of small, punctured
sack placed on the bottom of the zooecium. A small vibraculoid
avicularium is developed laterally near the apertura.
. ^^ ,7i(7=0.08
/'
Measurements.—Apertura
^
mm.
,-,
^ ^
/a=0.10 mm.
. Zs=0.60-0.70 mm.
Zocecia ^^^o.30-0.40 mm.
Variations.—The peristome is quite variable. The tremopores are
often obliterated by fossilization. The ovicell is truly recumbent or
partially supported on the distal zooecium. To accommodate so great
a peristomial complexity it is probable that the tentacles were very
long and fine.
Occurrence.—Middle Jacksonian (Castle Hayne limestone) : Wil-
mington, North Carolina (rare).
Type.—Cat. No. 62611, U-S.N.M.
Genus LAGENIPORA Hincks, 1877.
1877. Lagenipora Hincks. British Polyzoa, Annals Magazine Natural His-
tory (4), vol. 20, p. 215.
Colonies consisting of a number of cells immersed in a common cal-
careous crust. Zocecia recumbent, contiguous, lageniform; oral ex-
tremity free, tubular, with a terminal orbicular orifice. (Hincks.)
Genotype.—Lagenipora socialis Hincks, 1880.
Range.—Jacksonian-Recent.
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