346 MANUAL OF NATUEAL HISTOEY. 



riidse). Polyzoary dichotomously divided into 

 narrow, ligulate, bi- or multi-serial branches ; 

 no vibracula; avicularia, when present, pe- 

 dunculate and articulated ; polyzoary erect, 

 phytoid. 



9. Family. — Foliaceous Ascidian-Polyps (Flustri- 



dse). Polyzoary flexible, expanded, foliaceous, 

 erect, sometimes decumbent and loosely at- 

 tached ; cells multi-serial, quincuncial, or 

 irregular. 



10. Cellular Ascidian-Polyps (Celleporidse). Poly- 



zoary calcareous, cellular, composed of ovate 

 cells in juxta-position ; the aperture terminal, 

 often furnished with a globular capsule. 



11. Family. — Membranous Ascidian-Polyps (Mem- 



braniporidge). Polyzoary forming a gauze- 

 like incrustation, loosely adherent ; cells ob- 

 long, quadrangular, with a blunt hollow spine 

 at each angle. 



12. Family. — Honey-comb Ascidian-Polyps (Es- 



charidse). Polyzoary membrano-calcareous, 

 frondescent ; the cells immersed in a double 

 layer placed back to back, like the cells in 

 honey-comb. 



II. SUB-ORDER. — Eound-mouthed Ascidian-Polyps, 

 (Cyclostomata). 



Aperture of cell simple, circular. 



13. Family. — Tubular Ascidian-Polyps (Tubuli- 



poridse). Polyzoary massive, orbiculate or 



