Bulletin - United States National Museum - Smithsonian Institution

EARLY TERTIARY CHEILOSTOME BRYOZOA. 63
TUBUCELLA MONILIFERA, new species.
Plate 5, fig. 9.
Description.—The zoarium is free ; the two lamellae are placed back
to back and intimately joined; the fronds are broad, compressed,
distorted, and branching. The zooecia are much elongated, fusiform,
little distinct, surrounded by a collar of large pores ; the frontal and
the peristomiale are of equal length, separated by the ascopore and
perforated with small hexagonal pores. The peristome is salient,
thick, oblique. The avicularia are very rare, large, transverse, ellip-
tical, with two denticles for a pivot.
Measurements.— Locecia\ , „ „„
^ ry . fZ3=^0.90-1.00 mm.
[ fo=0.32 mm
Yariations.—The zooecia are very constant in their exterior aspect.
The larger pores surround the peristomiale and are three times larger
than the others.
Certain fronds bear some zooecia, closed, not by the oloc_yst, but by
the tremocyst, the tubules of which have encroached upon the peri-
stome. The physiological function of these zooecia is unlaiown.
The avicularia are scattered, are very large, and form a very large
frontal, the origin of which is one of the lateral pores of the peri-
stomiale.
Occurrence.—Middle Jacksonian: Wilmington, North Carolina
(common).
Eutaw Springs, South Carolina (rare).
Type.—Cd±. No. 62605, N.S.N.M.
Genus TUBIPORELLA Levinsen, 1909.
1909. TuhiporeJla TvEvinsen, Jlorphological and Sy.stematic Studies on the
Cheilostomatous Bryozoa, p. 204.
A membranous opercular valve. A vestibular arch ; each zocecium
with one or two avicularia at the height of the ascopore. The colony
occurs as a free foliaceous expansion, with a single layer of zooecia
(Levinsen).
Genotype.—Tubiporella {Lepralia) magnirostris MacGillivray,
1882.
Range.—Miocene-Recent.
Family CATENICELLIDAE Busk, 1852.
CATENICELLA SUBSEPTENTRIONALIS. new species.
Plate 5, fig. 5.
The Catenicellidae are bryozoa peculiar to the southern hemis-
phere. They abound in the recent seas off Australia, and their fossil