Bulletin - United States National Museum - Smithsonian Institution

64 BULLETIN 96, UNITED STATES NATIONAL MUSEUM.
forms are frequent in the same region. However, Waters discovered
in the Priabonian of the Vicentin ^ two species having some affinities
with this family; namel}'' Catenicella septentrional is Waters 1891,
and C. continua Waters, 1891. According to Waters^ the latter
species is a Vittaticella and the first belongs to a new genus.
The single and unique fragment found in America is very close
to Catenicella septentrionalis Waters, 1891. It differs from it in
its somewhat larger micrometric dimensions, more closely arranged
frontal pores, and in the presence of a small, oral avicuhirinm.
Occurrence.—Vicksburgian ;
Salt Mountain, 5 miles south of Jack-
son, Alabama. (Very rare.)
Type.—Cat. No. 62601, U.S.N.M.
Family ADEONIDAE Jullien, 1903.
The zooecia are provided with a compensatrix, but are devoid of
spines and oral glands. The areolae are always closed and exca-
vated out of the wall substance itself. The frontal is composed of
an olocyst covered by a very thick pleurocyst. The operculum
opens at the bottom of a peristomie. The female zooecia are of the
kind termed gonoecia and are often larger than the others; they con-
tain an ovicell sac in which the embryo is developed. The septulae
are numerous, placed in linear rows, arranged to correspond to the
areolae. The avicularia are frontal or interzocecial ; the latter have
no pivot.
Genus MENISCOPORA Gregory, 1893.
1893. Mcuiscopora Gregory. British Palaeogene Bryozoa, Transactions
Zoological Society of London, p. 250.
The zooecia are trimorphic. The normal axial zooecia have an
external aperture straighter than that of the marginal zoof-cia; the
aperture is formed of a semilunar anterior and of a very concave
posterior part. The gonoecia are larger than the ordinary zooecia
and their aperture is of different form. The peristomie is of slight
depth. Interzooecial avicularia are rare. Certain lateral areolae
are transformed into small frontal avicularia.
Genotype.—Meniscopora higihhera Gregor}^, 1892.
Range.—Thanetian-Helvetian.
Meniscopora {Lepralia) suhplana Ulrich, 1901, from the Lower
Eocene (Aquia) of Maryland and one new species from the Vicks-
bui-gian of Mississippi represent this genus in the United States.
^ North Italian Bryozoa, Quarterly Journal Geological Society London, vol. 47, 1891,
p. 5, pi. 1, ligs. 1-8.
2 Marine Fauna Zanzibar, Proceedings Zoological Society London, 1913, p. 483,