BRYOZOA OF THE PHILIPPINE REGION 



89 



Fig. 18. — Genus Flustra, subgenus Carbasea Gray, 1848 



A-H. Flustra (Carbasea) carbasea Ellis and Solander, 1786. A, B. Colonies, 

 natural size. C. Portion of surface showing zooecia without any spines. D. 

 Inferior portion of same colony (after Busk, 1854). E. Transverse section 

 through a branch (after Levinsen, 1909). F. Distal wall showing numerous 

 uniporous septulae, X25. G. Lateral wall, exhibiting multiporous septulae, 

 X25. H. A multiporous septula, X85. (F-H. After Waters, 1896.) 



I-K. Flustra (Carbasea) sagamiensis Okado, 1921. I. Optical section of 

 zooecium with zooid within, X100; dm, distal muscle; ocm, occlusor muscle; 

 pdm, parieto-diaphragmatic muscle; pvm, parietovaginal muscle; ts, tentacular 

 sheath; br, branchial retractors; lr, lophoric retractor; pm, parietal muscles. 

 gr, gastric retractor. J. Avicularian chamber to show the muscular arrange- 

 ment, X 250. K. Frontal view of several zooecia, with two zooecia and an avicu- 

 larium, X25. (I-K. After Okado, 1921.) 



