40 BULLETIN 125, 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 imhellis Hincks, 1860. 



This species differs from Membranipora galeata Busk, 1854, in the presence of 

 six to eight distal spines (and not four) and m 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 DUMERILn Savigny-Audoain, 1826. 



Plate 1, fig. 2; plate 2, fig. 23; plate 12, fig. 12. 



1826. Fhtstra dumerilii Audouin, Explication Savigny's Egypte, Polypes, pi. 10, fig. 12. 



1891. Membranipora dutnerilii W.\ters, North Italian Bryozoa, Quarterly Journal Geological 



Society of London, vol. 47, p. 12, pi. 2, fig. 4. 

 1894. Membranipora dumerilii Levinsen, Mosdyr, Zoologica Danica, Hefte 9, p. .57, pi. 4, figs. 22-25. 

 1907. Membranipora dumerilii Calvet, Bryozoaires Expedition scientifique du Travailleur (1881-82) 



et du Talisman (1883), p. 385 (bibliography). 

 1909. Callopora dumerilii Nokman, 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 I'Egypt, Memoires de 



rinstitute Egyptien, vol. 6, p. 196, pi. 10, fig. 7 (see for complete bibliography). 



1919. Calloporadumerilii, var. lata Canu and B assler, 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 vicmity 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.— Oligocme (Anguilla formation): Southwest side of 

 Crocus Bay bluffs, uppermost horizon, 125 feet above sea level, Anguilla, Leeward 

 Islands (rare) . Jacksonian (Castle Hayne limestone) : Wilmmgton, 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.—C&t. Nos. 68449, 68450, U.S.N.M. 



