222 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Fig. 82. — Genus Flabellaris Waters, 1898 

 A-U. Flabellaris roborata Hincks, 1881. A. Zoarium, natural size. B. 

 Three zooecia, much enlarged, devoid of their ectocyst. (A, B, after Hincks, 

 1888.) C. Segment containing the zooecia provided with their ectocyst and 

 opercular valve. D. Dorsal of the same segment. (C, D, after Busk, 1852.) 

 E. Ovicelled zooecia, X40. The proximal part of the ectooecium is uncalcified, 

 whereby a triangular area is formed. The horizontal part of the distal wall 

 (d. w.) is visible. F. Zooecia not ovicelled, X40. Three of the zooecia which 

 show only a single avicularium have an internal avicularium (placed in the cavity 

 of the zooecium); this avicularium is attached just inside of the small area beside 

 the external avicularium. G. The proximal end of a zooecium, X75, with a 



