40 
BULLETIN 12o, UNITED STATES NATIONAL MUSEUM. 
zooecia are larger and become almost triangular. Regenerated zooecia are quite 
frequent. Although the ovicell projects much on the opesium, we think, however, 
that it does not become closed by the operculum. Moreover, the zooecial form is 
that of Alderina imbellis Hincks, 1860. 
This species differs from Membranipora galeata Busk, 1S54, in the presence of 
six to eight distal spines (and not four) and in the absence of a triangular area on 
the ovicell. 
Occurrence. —Miocene (Duplin marl): Natural well, 2 miles southwest of Mag¬ 
nolia, Duplin County, North Carolina (rare). 
Holotype. —Cat. No. 68448, U.S.N.M. 
Genus CALLOPORA Gray, 1848. 
(For description see Bulletin 106, U. S. National Museum, p. 145.) 
CALLOPORA DL'MERILII Savigny-Audouin, 1826. 
Plate 1, fig. 2; plate 2, fig. 23; plate 12, fig. 12. 
1826. Flustra dumerilii Audouin, Explication Savignv’s Egypte, Polypes, pi. 10, fig. 12. 
1891. Membranipora dumerilii Waters, North Italian Bryozoa, Quarterly Journal Geological 
Society of London, vol. 47, p. 12, pi. 2, fig. 4. 
1814. Membranipora dumerilii Levin-sex, Mosdyr, Zoologies Danica, Hefte 9, p. 57, pi. 4, figs. 22-25. 
1907. Membranipora dumerilii Calvet, Bryozoaires Expeditionscientifique du Tratailleur (1881-82) 
et du Talisman (1883), p. 385 (bibliography). 
1909. Callopora dumerilii Nor ma^ , On the polyzoa of Madeira and neighboring islands, Linnean 
Society Journal, Zoology, vol. 30, p. 287. 
1912. Membranipora dumerilii Canu, Etude des Bryozoaires Helvetiens de l’Egypt, Memoires de 
l’lnstitute Egyptien, vol. 6, p. 196, pi. 10, fig. 7 (see for complete bibliography). 
1919. Calloporadumerilii, var. lata CANuand Bassler, Geology and Paleontology of the West Indies, 
Bryozoa Publication Carnegie Institution of Washington, No. 291, p. 81, pi. 1, fig. 1. 
1920. Callopora dumerilii Canu and Bassler, North American Early Tertiary Bryozoa, Bulletin 
106, U. S. National Museum, p. 148, pi. 3, fig. 15. (see for zoological and paleontological 
bibliography). 
This species presents two different aspects. Very frequently the zooecium is 
almost elliptical and there are two symmetrical frontal avicularia (as figured by 
Waters, Levinsen, and Busk). More rarely the zooecium is oval and there is only 
a single small interopesial avicularium (as figured by Hincks and Jullien). One 
specimen from Anguilla has this second aspect which appears to be that of zooecia 
in the vicinity of the ancestrula (pi 1, fig. 2). In 1919 we separated this second 
form as a new variety, var. lata, but until more specimens are collected we now 
prefer to leave the synonymy as above. 
We refer doubtfully to this species two specimens incrusting a shell from the 
lower Miocene of Florida which appear to agree with Busk’s figure of 1850 (pi. 12, 
fig. 12). 
American occurrence. —Oligocene (Anguilla formation): Southwest side of 
Crocus Bay.bluffs, uppermost horizon, 125 feet above sea level, Anguilla, Leeward 
Islands (rare). Jacksonian (Castle Hayne limestone): Wilmington, North Carolina 
(rare). Miocene (Bowden marl); Bowden Jamaica (rare). Miocene (Chipola 
marl): Chipola River, Calhoun County, Florida (rare). 
Habitat. —Dredged to a depth of 280 meters. 
Plesiotypes. —Cat. Nos. 68449, 68450, U.S.N.M. 
