290 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Fig. 121. — Genus Cigclisula Canu and Bassler, 1927 

 A-O. Cigclisula occlusa Busk, 1885. A. Complete zoarium, natural size 

 (afterMarcus, 1922). B. Group of zooecia, X25, with inlerzooecial aviculana. 

 C. Details of orifice showing the place of the oral avicularium and the penstornie, 

 X50 D Ovicelled zooecium with its sievelike area, X25. E. Transverse 

 section showing the tabulated glands (gl) at the base of the zooecium; opercu- 

 lum (op), tentacles (ts); X85. F. Section of the duct or reservoir, X250 O. 

 Longitudinal section through the broader axis of the zoarium, showing the lobu- 



