26 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
MEMBRANIPORINA VINCULARINA, new species. 
Plate 9, figs. 8-10. 
Description .—The zoarium is free, vincular, formed of two lamellae back to 
back, composed of four to eight longitudinal rows of zooecia. The zooecia are 
elliptical, distinct, separated by a deep furrow; the mural rim is wide, rounded, 
tuberose somewhat wider in the proximal portion; the opesium is regular, elongated, 
elliptical. 
Measurements .—Opesia 
ho = 0.24-0.32 mm. „ . f Lz = 0.40-0.50 mm. 
Zo = 0.14-0.16 mm. ° 0ecia 1 lz= 0.30-0.36 mm. 
Affinities.—We have not yet discovered an ovicell on any of our specimens. The 
quadrangular zoaria have much resemblance to Farcimia, but their zooecia are 
identical with those of the multiserial colonies. 
Occurrence .—Miocene (Choctawhatchee marl): Jackson Bluff, Ocklocknee 
River, 25 miles southwest of Tallahassee, Florida (rare). Miocene (Yorktown 
formation): 3 miles southwest of Petersburg, Virginia (very rare). 
Cotypes. —Cat. Nos. 68412, 68413, U.S.N.M.. 
Genus CONOPEUM Norman, 1903. 
(For description see Bulletin 106, U. S. National Museum, p. 86.) 
CONOPEUM LACROIXII Busk, 1852. 
Plate 1, fig. 6. 
1919. Conopeum lacroixii Canu and Bassler, Monograph Early Tertiary Bryozoa of North America, 
Bull. 106, U. S. National Museum, p. 89, pi. 13, fig. 9. (Bibliography, history and dis¬ 
tribution.) 
ho = 0A0 mm. 
ry . f Z 2 = 0.50 mm. 
Zooecia 7 oc 
l iz — 0.28 mm. 
Measurements .—Opesia . 7 . ... 
1 t to = 0.20 mm. 
Although we have had the good fortune to discover the true Membranipora 
lacroixii Audouin, 1826 (see p. 22, pi. 29, fig. 4), it is evident that the present species 
ought henceforth to be classed under Busk’s name of 1852. We have no new 
observations to add to our previous description of this species, for the Miocene 
specimens are very rare. 
Occurrence .—Miocene (St. Mary’s formation): Bowler’s wharf, 18 miles above 
Urbana, Middlesex County, Virginia (rare). Miocene (Calvert formation): Reeds, 
Maryland (rare). Miocene (Bowden marl): Bowden, Jamaica (rare). 
Plesiotype. —Cat. No. 68414, U.S.N.M. 
CONOPEUM OVALE Canu and Bassler, 1919. 
Plate 5, fig. 6. 
1919. Conopeum ovale Canu and Bassler, Geology and Paleontology of the West Indies Bryozoa, 
Pub. Carnegie Institution of Washington, No. 291, p. 77, pi. 5, fig. 6. 
Description .—The zoarium incrusts shells. The zooecia are distinct, elongated, 
oval, the point above, separated by a deep furrow; the mural rim is thin, oblique, 
flat; the opesium is entire, oval. There are two orbicular impressions at the base 
of the zooecia. The interopesial cavities are irregular and rare. 
,, * ■ fAo = 0.30 mm 
Measurements .—Opesia i , „ „ „ 
1 l to = 0.15 mm 
Zooecia 
Lz = 0.35 mm. 
lz = 0.25 mm. 
