BRYOZOA OF THE PHILIPPINE REGION 219 



Genus FLABELLARIS Waters, 1898 



The structure of the ovicell is that of the family Alderinidae; an 

 incomplete calcification forms a frontal cicatrix of variable shape; 

 the opercular valve does not close the ovicell. The zoarium is 



fravr- 



Fig. 79. — Genus Tricellaria Fleming, 1828 

 . A-C. Tricellaria (Cellaria) lernala Ellis and Solander, 1786. A. Enlarged 

 portion of colony, X30, showing zooecia in groups of three, except the ooecial 

 internodes (oe). Lateral avicularia (av) well developed; fr av, frontal avicu- 

 larium; ap,aperture; sp, spine; j, joint; sc, scutum. B. Dorsal view of zoarium 

 X30 at the bifurcation of a branch (bi. br) showing the adjoining zooecia (lat. 

 toe) and root chamber (r. ch) with upward extending rootlet (r). C. Single 

 zooecium, X30, to show the position of the two kinds of root fibers, those ancho- 

 ing the colony (r), arising in a simple root disk (r. d) on the front wall of the 

 zooecium; those extending upward (u. r) arising from a rather large chamber 

 (r. ch) projecting from the zooecial wall just above the lateral avicularium. 

 (A-C, after Robertson, 1905.) 



D-F. Diagram of bifurcation in Tricellaria. D. T. lernala Ellis and Solander, 

 1786. E. T. occidentalis var. dilalala Harmer 1923. F. T. aculcala D'Orbigny, 

 1816. (D-F, after Harmer, 1923.) 



radicellate, unilamellar, flexible, or articulated, almost always multi- 

 serial. The articulation is apparent, hidden, or absent. Very fre- 

 quently one of the frontal avicularia develops in the interior of the 

 zooecium itself. The zooecia are elliptical, with gymnocyst small or 

 absent. No scutum. 



