BRYOZOA OF THE PHILIPPINE REGION 



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Q ' M 



Fig. 16. — Genus Flustra Linnaeus, 1758 



A-Q. Flustra foliacea Linnaeus, 1758. A. Colony, natural size. B. Group 

 of nonovicelled zooecia, X16. C. Group of ovicelled zooecia, X16. D. Group 

 of young zooecia without spines, X 16. E. Zooecium transformed into an 

 avicularium X32. F. Lateral face of a zooecium after boiling in caustic potash, 

 showing its polygonal structure, X41. G. Two small polygons of F concen- 

 trically striated, XI 16. H. Distal wall with its uniporous septula. I. a, b, 

 uniporous septulae of the distal wall, X240, X429; c, multiporous septulae of 

 the lateral walls, X240. J. Two ovicelled zooecia showing the true ends of the 

 ovicell, X32. K. Same as J, dorsal view, X32. L. Interior vieAv of an isolated 

 ovicell (oe) without ectocyst, X33.5. M. Longitudinal section through ovi- 

 celled zooecia. N. Lateral wall with its multiporous septulae. O. Two zooecia 

 after boiling in potash. The lateral walls' composition of small plates is seen; 

 X40. P. Some zooecia from the basal surface after boiling in potash. The 

 distal wall with its septula is seen and the composition of the basal wall in small 

 plates. A very fine structure parallel to the distal lines is not visible in this 

 figure; X40. Q. Diagrammatic section through the ovicell; op, operculum; 

 v, vestibulum; ekto, ectocyst; endo, endocyst. 



