Bulletin - United States National Museum - Smithsonian Institution

30 BULLETIN 96, UNITED STATES NATIONAL MUSEUM.
The aviculariiim is interzocccial, smaller than the zoa>cia, losangeshaped,
Avith a small distal canal and a round opesium.
,, ^ r^ {ho=0.12 mm.
Measurements.—UpesmmL -^_ •
^
/-it -i ^ \
|7o=0.16 mm. (incmamg the opesmles).
,, . , . (Lb=0.50 mm.
Marginal zooecia , ^ ^ „„
p=0.30 mm.
Very often the proximal border of the opesium is simply undu-
lated and the opesiules are visible only on account of the opesiular
teeth. The opesia of the ovicelled zooecia seem a little larger than the
others.
Occurrence.—Upper Jacksonian; West bank of Sepulga River,
Escambia County, Alabama (rare).
Type.—Q^i. No. G2585, U.S.N.M.
Subfamily LuNULARiiDAE Levinsen, 1909.
Genus LUNULARIA Busk, 1884.
1884. Lunularia Busk, Report on Polyzoa collected by Challenger, Clieil-
ostomata, vol. 10, pt. 30, p. 208.
The zoarium has the Lunulites form. The avicularia are sym-
metrical. Exteriorly and interiorly the zooecia are arranged in radial
rows. The cryptocyst is more or less developed. Both radicular and
hydrostatic zooecia are present. The ovicell is endozocecial.
Genotype.— Lunulites capulus Busk, 1884.
Range.—Cenomanian-Recent.
Lunulites Lamarck, 1812, is not a definite generic type, but is
merely a zoarial form adopted for certain reasons. This style of
growth obtains in many genera of cheilostome bryozoa, e. g. Otionella
and Trochopora in the Anasca Malacostega; Lunularia and
Selenaria in the Anasca Coilostega, and Stichopora^ Fedora^ and
Bipora in the Ascophora.
Thirteen species of Lunularia represented in many cases by abundant
specimens are known in the Lower Tertiary strata of the United
States. Of these only five, L. reversa Ulrich, 1901, Z. distans Lons-
dale, 1845, L. fenestrata DeGregorio, 1890, L. vickshurgen^is Conrad,
1847, and L. contigua Lonsdale, 1845, are described.
Family ASPIDOSTOMIDAE Canu, 1908.
The zooecia have a raised margin, often indistinctly or incom-
pletely developed. The two opesiules appear as narrow incisions,
which join the zocecial aperture; the short polypide tube, which is
not continued under the cryptocyst cover, is in most cases provided
with marginal flanges. Avicularia are always present. Ovicells are
hyperstomial.