Bulletin - United States National Museum - Smithsonian Institution

EARLY TERTIABY CHEILOSTOME BEYOZOA. 69
Genus HEMICYCLOPORA Norman, 1909.
1909. Hemicyclopora Norman, Polyzoa of Madeira and neighboring islands.
Journal Linnean .Society, London, Zoology, vol. 30, p. 308.
The ovicell is recumbent. The apertiira is provided with very low
cardelles and formed of a large anter and of a small concave poster.
The frontal is smooth and formed of an olocyst. Spines.
Genotype.—Hemicyclopora (Lepralia) polita Hincks, 1880.
Range.—Helvetian-Recent.
HEMICYCLOPORA PARAJUNCTA, new species.
Plate 6, fig. 6.
Description.—The zoarium incrusts shells. The zooecia are dis-
tinct, somewhat elongated, ogival; the frontal is somewhat convex
and absolutely smooth. The apertura is oblique, suborbicular ; the
peristome bears 8 distal spines and a proximal small mucronoid lip.
The ovicell is globular, very salient, smooth, very little joined to
the distal zocecium ; it is recumbent, hyperstomial.
f7i«:z=0.10mm.
MeasureTnents.—Apertura 1 7^—0 99 mm
7.2=0.50-0.55 mm.
f
Zooecia
|/5= 0.40-0.55 mm.
Affinities.—This species offers the exterior aspect of a Perigastrella
with very small areolae, which generally appear smooth.
Occurrence.—Middle Jacksonian : Near Lenuds Ferry, South Carolina
(common).
Type.—C^t. No. B2610, U.S.N.M.
Genus MASTIGOPHORA Hincks, 1880.
1880. Mastigophora Hincks, British Marine Polyzoa, p. 278.
The ovicell is small and recumbent. The apertura is semilunar;
its proximal border is straight and bears a rimule elongated and
rounded. The frontal is a tremocyst with small pores placed on an
olocyst. Vibracula.
Genotypes.—Mastigophora hyndmanni Johnson, 1847, and Mastigophora
{Flustra) dutertrei Savigny-Audouin, 1826.
Range.—Lutecian-Recent.
Both of the genotypes of this well-marked genus occur in the
Jacksonian and Vicksburgian strata of the Southern States.
SCHIZOBATHYSELLA, new genus.
{jSchizos, slit, and bathys, deep, referring to the position of the
apertura.)