NORTH AMERICAN EARLY TERTIARY BRYOZOA. 



631 



Genotype. C ' onescharellina cancellata Busk, 1852. 

 Range. Miocene Recent. 



The lunoecia are the openings of special compensation zooeciules. 

 All the unilamellar Bipora of Whitelegge, 1887, are classified in this genus 

 by Levinsen. 



Genus BIPORA Whitelegge, 1887. 



1S87. Bipora WHITELEGGE, Notes on some Australian Polyzoa, Proceedings Linnean Society 

 New South Wales, ser. 2, vol. 11, p. 337. 



The zoarium with lunoecia. The 

 zoaria are plate-like or fan-shaped 

 with two layers of zooecia ; ovicells 

 are not found. (After Levinsen, 

 1909.) The apertura has a proximal 

 rimule. 



Genotype. B ip ora umbonata 

 Haswell, 1880. Recent. 



C 100 



Genus FLABELLIPORA D'Orbigny, 1852. 



1852. Flabellipora D'Orbigny, Paleon- 



tologie Prancaise Terrain Cre 1 - 

 tacg, vol. 5, p. 432. 



The zoaria, which have no lunoe- 

 cia, are plate-like, two layered; no ovicells. 

 tura has a proximal rimule. 



Genotype. Flabellipora elegans D'Orbigny, 1852. Recent. 



FIG. 193. Genus Bipora Whitelegge, 1887. 

 A-D. Bipora umbonata Haswell, 1880. A. Zoarium, 

 natural size. B. Zooecia and lunoecia magnified. 

 (After Haswell, 1880.) C, D. Bipora crassa Tenison- 

 Woods, 1880. Operculum and avicularian mandible, 

 X 100. (After Kirkpatrick, 1890.) 



After Levinsen, 1909.) The aper- 



FIG. 194. Genus Flabellipora D'Orbigny, 1852. 



A-P. Flabellipora elegans D'Orbigny, 1852. A-D. Four views of the enlarged zoarium. 

 (After D'Orbigny, 1852.) E. Various aspects of a zoarium natural size. P. Zooecia and 

 avicularia, X 25. (E, P after Waters, 1887.) 



