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BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



the median axis of the zooecium. The aperture is elliptical with two 

 submedian cardelles. The ovicell is hyperstomial, closed by the 

 operculum, embedded in the distal zooecium. 



Genotype. — Eionidella excelsa Koschinsky, 1885. 



Range. — Eocene (Lutetian) — Oligocene (Vicksburgian). 



Fig. 204. — Genus Stenosipora Canu and Bassler, 1927 



A-B. Stenosipora (Stichoporina) simpler Koschinsky, 1888. A. Portion of 

 external surface, Xll, with ovicelled zooecia. B. Portion of the inner surface, 

 X 15, showing the hexagonal form of the zooecia. 



C, D. Stenosipora (Stichoporina) crenilabris Koschinsky, 1885. C. Isolated 

 zooecia, X 22. D. Meridian section, X 22, showing the parietal septulae. 



E, F. Stenosipora (Stichoporina) protecta Koschinsky, 1885. E. Ancestrula and 

 the six ancestrular zooecia, Xll. F. Meridian section showing the basal sep- 

 tulae and the cavities of the internal face, X 22. 



G-J. Stenosipora bidentala Reuss, 1869. G. Zoarium, natural size. H. View 

 showing the ancestrula and the six surrounding zooecia, X25. I. An ovicelled 

 zooecium, X25. J. Oral aperture, X85. (G-J. After Waters, 1919.) 



This genus differs from Stenosipora in little of importance. The 

 difference consists in the cylindrical form of the colonies, in the con- 

 verging direction of the avicularian beak and in the fusiform base of 

 the zooecia. 



The known species of this genus are as follows : 



Kionidella excelsa Koschinsky, 1885 Lutetian. 



Kionidella obliqueseriata Koschinsky, 1885 Lutetian. 



Kionidella (Discoflustrellaria) dactylus D'Orbigny, 852 Lutetian. 



Kionidella (Stichoporina) protecta Canu and Bassler, 1920 (not Jacksonian. 



Koschinsky, 1885). 



Kionidella (Fedora) pusilla Canu and Bassler, 1920 Vicksburgian. 



