22 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
MEMBRANIPORA LACROIXII Audouin, 1826. 
Plate 29, fig. 4. 
1826. Flustra lacroixii Audouin, Explication des planches de Polypes de l’Egypte. ... In 
Savigny’s Description de L’Egypte, Historie Naturelle, vol. 1, 1809, pt. 3, p. 240, pi. 10, 
fig. 9 (not Busk, Hincks, Canu). 
Measurements. —Ordinary zooecia: Opesia 
7to = 0.40 mm. 
lo = 0.22 mm. 
Zooecia 
\Lz = 0.50 mm. 
\lz = 0.32-0.34 
mm. 
First zooecia of a row: 
Opesiaj 
Zooecia' 
7 w = 0.40 mm. 
lo = 0.24-0.28 mm. 
\Lz = 0.50-0.56 mm. 
1 Iz = 0.40 mm. 
Variations. —The mural rim is flat and finely striated. There is a constant 
tubercle at each interzooecial angle. The zooecium giving rise to two or more 
series is much larger. Our specimen is exactly like Audouin’s figure of 1826. 
Affinities. —Years ago Waters noted that the Membranipora lacroixi of Busk 
and Hincks was probably not Audouin’s species. Canu, sharing this opinion, has 
carefully revised the synonymy. 4 The unexpected discovery in America of 
Andouin’s species confirms therefore the idea of both Waters and Canu. There is no 
necessity of a new name, since our specimen appears to indicate Membranipora 
more than Conopeum. 
This species differ from Membranipora fossulifera Ulrich and Bassler, 1904, in 
the presence of tubercles at the interzooecial angles. It is much larger than Bijlustra 
savarti Smitt, 1872, which belongs moreover to another genus. 
Occurrence. —Pliocene (Waccamaw marl): Waccamaw River, Horry County, 
South Carolina (rare). 
Habitat. —Red Sea or Mediterranean (Audouin): 
Plesiotype. —Cat. No. 68405, U.S.N.M. 
MEMBRANIPORA TUBERCULATA Bose, 1802. 
Plate 33, figs. 3-5. 
1802. Flustra tuberculata Bose, Histoire naturelle des Vers, vol. 3, p. 118. 
1839. Flustra tehuelca D’Orbigny, Voyage dans l’Amerique-MMdionale, vol. 5, pt. 4, Zoophytes, 
p. 17, pi. 8, fig. 10-14. 
1858. Membranipora tuberculata Busk, Zoophvtology: On some Madeiran Polyzoa, Quarterly 
Journal of Microscopical Science, vol. 6, p. 126, pi. 18, fig. 4. 
1898. Membranipora tehuelca Waters, Observations on Membraniporidae, Journal of the Linnean 
Society, Zoology, vol. 26, p. 674, pi. 48, fig. 6-8. 
1908. Membranipora tehuelca Robertson, The incrusting Cheilostomatous Bryozoa of the West 
Coast of North America, University of California Publications, Zoology, vol. 4, no. 5, 
p. 265, pi. 15, fig. 16, 17; pi. 16, fig. 18. 
1909. Membranipora tuberculata Norman, The Polyzoa of Madeira and neighboring Islands, Journal 
Linnean Society London, Zoology, vol. 30, p. 286. 
* See North American Early Tertiary Bryozoa, p. 89. 
