NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 201 
Family THEONOIDAE Busk, 1859. 
Genus THEONOA Lamouroux, 1821. 
THEONOA GLOMERATA Ulrich and Bassler, 1904. 
Plate 26, figs. 9-12. 
1904. Theonoa glomerata Ulrich and Bassler, Maryland Geological Survey, Miocene, p. 406, 
pi. 109, figs. 4, 5. 
The original description of this species was as follows: 
Zoarium cake shaped when young and growing irregular with age, the under side covered with a 
concentrically wrinkled epitheca, the upper side with short or broken irregularly arranged celluliferous 
ridges separated by deep interspaces. Ridges abruptly elevated, their flattened summits usually 
exhibiting a double row of subangular zooecial apertures. Here and there, probably through confluence 
of two or more ridges, considerable clusters of apertures occur, while other groups may not contain 
more than three or four cells. Occasionally an irregular radial arrangement of the ridges is apparent. 
About four zooecial apertures in 1.0 mm. 
Occurrence. —Miocene (St. Mary’s formation); St. Marys River, Maryland (rare). 
Cotypes. —Cat. No. 68746, U.S.N.M. 
Family DIAPEROECIIDAE Canu, 1918. 
Genus STATHMEPORA Canu and Bassler, 1922. 
Greek: stathme = line or cord. In allusion to the rectilinear form of the 
fascicles. 
The ovicell is a vesicle traversed by the tubes of which the peristomes are 
much scattered. The tubes are cylindrical and grouped in linear, uniserial fascicles. 
Gemmation is triparietal. 
Genotype.—Stathmepora flabellata, new species. Pleistocene. 
STATHMEPORA FLABELLATA, new species. 
Plate 43, figs. 10-17. 
Description. —The zoarium is bushy and formed of bilamellar, Jlabellate fronds. 
The fascicles are uniserial, little salient, arranged perpendicularly to the zoarial 
margins. The tubes are visible only when they are isolated. The ovicell is an 
irregular vesicle pierced by fascicles whose tubes are then more adjacent. 
Measurements .— 
Diameter of the peristome. 0. 12 mm. 
Zooecial diameter.-.0.18 mm. 
Distance between the peristomes. 1. 00 mm. 
Separation of the peristomes. 0. 56-0. 80 mm. 
Variations. —The fascicles are not exactly analogous to each other. They 
form, moreover, some lines with tubes adjacent like true fascicles. The basal 
lamella is large and the zone of growth is thick. 
The ovicell is formed after the consolidation of the adjacent tubes, for the 
fascicles are not disarranged. If the peristomes are scattered the peristomies are 
long and never adjacent. It is probable that fossilization caused the long non- 
ad jacent peristomies to disappear from the species, of which the bases alone are 
visible. 
22184—23—Bull. 125-14 
