NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
23 
1911. Membranipora tehuelca Guerin-Ganivet, Contributions a l’etude des Bryozoaires des cotes 
Armoricaines II, Bryozoaires provenant de la rade de Brest, et recueilles par les freres 
Crouan, Travaux scientifiques du Laboratoire de Zoologie de Concameau, vol. 3, fasc. 5, 
p. 6, fig. 3. 
1912. Membranipora tehuelca Osburn, The Bryozoa of the Woods Hole Region, Bulletin Bureau 
Fisheries, vol. 30, 1910, p. 231, pi. 24, fig. 40. 
We agree with Norman that this species is indeed that of Bose, who indicated 
it as very abundant on the algae of the Sargossa Sea. These algae, swept along by 
the equatorial current, have transported to America a considerable number of 
European species. This particular one has made the tour of America. One of our 
fossil specimens still retains its ectocyst and its corneous opercular valve. 
Occurrence. —Pleistocene: Santa Monica (Rustic Canyon), California (rare). 
Habitat. —Eastern Atlantic off France, Senegal, Madeira, and Angola. Western 
Atlantic: United States, Chagos Isles, Pernambuco, Rio Janeiro, Patagonia. 
Pacific: Kursachee and California. 
Plesiotype. —Cat. No. 68406, U.S.N.M. 
MEMBRANIPORA VAUGHANI Canu and Bassler, 1919. 
Plate 2, fig. 1. 
1919. Membranipora vaughani Canu and Bassler, Geology and paleontology of the West Indies, 
Bryozoa, Publications of the Carnegie Institution of Washington, no. 291, p. 77, pi. 2, fig. 1. 
Description. —The zoarium incrusts shells. The zooecia are little distinct, 
united among themselves by their mural rim, elongated, hexagonal; the mural 
ri m is flat, granular, everywhere of equal width. The opesium is elliptical or oval, 
finely crenulated. Between the zooecia at the angles of junction large rounded 
tubercles occur. 
Measurements. 
„ . \ho = 0.32 — 0.36 mm. 
-0.22-0.24, 
■ mm, 
Zooecia 
Lz = 0.40 — 0.44 mm. 
lz = 0.32 mm. 
Affinities. —A single specimen has been found and its zooecia are somewhat 
deformed by the substratum. The species differs from Membranipora tuberculata 
Busk, 1859, from the English Crag in its much larger micrometric measurements. 
It differs from Membranipora tuberculata Bose, 1802 (not Busk, 1859) in the much 
more reduced and very different form of its interzooecial tuberosites. 
Occurrence. —Lower Miocene (Bowden horizon): Cercado de Mao, Santo Domingo 
(very rare). 
Holotype. —Cat. No. 68407, U.S.N.M. 
MEMBRANIPORA!?) TUBERIMARGO, new species. 
Plate 9, fig. 12. 
Description. —The zoarium incrusts shells. The zooecia are distinct, separated 
by a deep furrow, elongated, elliptical. The mural rim is thin, rounded, a little 
enlarged at the base; it bears one pair of distal and two pairs of lateral tuberosities. 
The opesium is large, anterior, elliptical. 
Measurements. —Opesia 
ho = 0.40 — 0.45 mm. 
lo = 0.25 -0.30 mm. 
Zooecia 
Lz = 0.45 mm. 
lz = 0.35 -0.40 mm. 
