yOKTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 



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Fig. 22. — Subgenus Ellipsopora, new. 



A-F. EUipsopora (Microporella) Jlabellaris 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) Jlabellaris Busk, 1852. Recent. 



Fio. 23.^Subgenu8 Flmtramorpha Gray, 1848. 



A-H. Fliistramorpha marginata Krauss, 1837. A. Zooecia with their avicularium, X 40. B. The 

 distal end of a zooeciiun, X 100. C. Foirr 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, IT. Operculum and mandible. (After 

 Busk, 1885.) 



