230 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



Zooecial walls salient, flaring outward from the centrally depressed 

 cryptocyst area. Parenthesis-like cryptocyst ridges beaded. Zo- 

 oecial orifice protruding and cellariaeform; its upper lip hemispherical 

 and beaded, its lower lip convex and smooth. Zooecial orifice set a 

 considerable distance away from the distal arched wall. Ovicells 

 form a gently rounded bulge under the frontal and lateral walls of the 

 neighboring distal zooecia. Ooeciopore slitlike, somewhat crescentic. 

 Avicularia much smaller than zooecia, vicarious, with smaller tri- 

 angluar mandible, longer than wide. The species is named for the 

 beading on its upper lip, although other characters like the nature of 

 the avicularia, beaded cryptocyst lines, and general appearance set it 

 apart from other Cellaria species. 



Coloisy: Some colony sprigs are about 4 cm, long and openly 

 branched. The colony color is a translucent glassy white, with a 

 slightly yellowish tint. The zooecia are calcareous while the nodes or 

 joints are chitinous. The growth habit is erect, free, the branching 

 loose and dichotomous. The slender branches which range in length 

 from about 5 to 13 mm. are the internodes. They arise at the very 

 short, tangled radicle nodes or joints. This condition is called nodate 

 articulation. Zoids are arranged in successive linear series of four 

 around the imaginary longitudinal axis of the branches. The sm'face 

 face of each series fits in a zig-zag fashion into the surface face of the 

 next series because the frontal surface of each zooecium is hexagonal. 

 The branches are cylindrical, and zoids open out on each face of the 

 cylinder. The cjdinder is roughly either 4- or 8-sided in cross section, 

 depending upon the level at which the cut is made. If the branch is 

 sectioned near the midregion of a series of four zoids abreast, then the 

 cylinder will be approximately 4-sided. If sectioned near the proximal 

 or distal ends of a series of four zoids, the cylinder will be roughly 8- 

 sided, because the cut is made through zig-zagging zoids of two 

 successive series. The nonfertile branches are slender, with a diam- 

 eter of 0.317 to 0.461 mm. (average 0.422 mm.). Branches bearing 

 ovicells are a bit stouter and more bumpy than nonfertile branches. 

 The diameter of the ovicelled branches ranges from 0.432 to 0,533 mm. 

 (average 0.458 mm.). The branches have a slightly wavy outline in 

 side view because the distal arches of the zoids in each series project 

 outward more prominently than the midregions of the zoids. 



Zooecia: A thin salient line encloses each zooecium. Zooecia 

 appear superficially hexagonal, with the distal region somewhat, and 

 the proximal region especially, coming to a sharp point and arranged 

 in a transverse row or series of four around the branch. The pro- 

 jecting distal zooecial corner varies in shape from a sharply pointed, 

 rooflike structure to a more gently pointed arch, being angular in 



