NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
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Fig. 22. —Subgenus Ellipsopora, new. 
A-F. Ellipsopora ( Microporella ) flabellaris Busk, 1852. A. Zooecia with avicularia, X 40. B. The 
distal end of a zooecium, X 100. C. Zooecia from the basal surface, X 40. Besides the basal wall of the 
dietellae, the small triangular basal surface of the vibracular chamber is seen lowest down to the right 
on the four zooecia. On some zooecia the basal surface shows a septula and on others an opening corre¬ 
sponding with a septula in an opposite zooecium. D. Radical fibers, X 140. E. Operculum, X 140. 
F. Mandible, X 55. (A-F, after Levinsen, 1909.) 
Ellipsopora, new subgenus. 
The aperture is transverse, elliptical. The operculum is elliptical and closes 
the ovicell. The frontal is a tremocyst. There is a vibraculum on each zooecium. 
Genotype.—Ellipsopora ( Eschara) flabellaris Busk, 1852. Recent. 
Fig. 23.—Subgenus Flustramorpha Gray, 1848. 
A-H. Flustramorpha marginata Krauss, 1837. A. Zooecia with their avicularium, X 40. B. The 
distal end of a zooecium, X 100. C. Four zooecia, from the basal surface, X 40. In addition to the 
marginal dietellae, each basal zooecial surface shows a rosette plate (=septula) and an opening for com¬ 
munication with zooecia in the opposite layer. D. Radical fibers, X 40. E. Operculum, X 140. F. 
Avicularian mandible, X 55. (A-F, after Levinson, 1909.) G, H. Operculum and mandible. (After 
Busk, 1885.) 
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