NOI5TH AMERICAN EARLY TEKTIARY BRYOZOA. 



FIG. 276. Genus Ascosoecia Cauu, 1919. 



Forma Zonopora D'Orbiguy, 1854 (=Zonatula Gregory, 1909). 



A-I. Ascosoecia (Zonopora) arborea Koch and Dunker, 1837. A. Zoarium restored, natural 

 size, from the Neocomian of France. B. Surface of a well preserved zoarium with salient peri- 

 stomes. C. Surface of a worn zoarium with nonsalient peristomes. (A-C, after D'Orbigny, 1854.) 

 D. Longitudinal section. (After Pergens, 1889.) The walls are vesicular. B. Surface of a 

 zoarium of the variety subnodosa, X 10. F. Transverse section of the same variety, X 10. G. 

 Transverse section, X 10, showing, like the preceding, that the walls of the tubes are vesicular 

 (=moniliform of Gregory). H. A transverse section, X 10, showing the apertures and single 

 circle of mesopores. I. Part of a vertical section, X 10, from the same specimen showing the 

 moniliform walls of the zooecia. (D-I. After Gregory, 1909.) 



Ascosoecia (Zonatula) pscudotorqitata Hagenow, 1851. J. Zoarium, natural size, from the 

 Cretaceous at Maastricht. K. Portion of the surface, X 20. (After Pergens, 1893.) 



L. Part of a vertical section, X 18, near the edge of a zoarium of var. irregularis showing 

 zooecia cut longitudinally and transversally, and mouiliform distal walls of the outer zooecia. 



M. Part of the vertical section, X 18, of a long branch, 5 mm. in diameter, of var. irregu- 

 laris. (L, M, after Gregory, 1909.) 



Ascosoecia (Zonopora) liperiensis D'Orbigny, 1853. N. Ovicell found on a specimen from the 

 Maastrichtian at Royan, France, X 12. O. Interior of ovicell on a specimen from the same 

 locality, X 20. 



55899 20 Bull. 106 53 



