ZOOPHYTA ASCIDIOIDA. 247 



* Natives of the sea. (Tentaciila forming a perfect 

 circle.) Polypiaria infundibalatii P. Gervais. 



Family I. VESICULAKlADiE. 



Poh/pidoms corneous, Jistular, conjervoid : cells vesicular, 

 deciduous, non-oijerculate. 



22. Vesicularia. Cells ovate, disjunct, uniserial, unilateral. 



23. Serialaria. Cells tubulous, adjacent, uniserial, unilateral. 



24. Valkeria. Cells ovate, clustered, or in pairs. 



23. Bowerbankia. Cells elliptical, irregularly scattered, unila- 

 teral. 



Family II. CRISIADiE. 



Pohjpidom calcareous or suhcalcareous, branched, confervoid, 

 jointed : the cells linked together in one or more series, distinct, 

 tubular or elliptical, ivith a terminal or suhterminal aperture, 

 never closed loith an operculum. 



26. Crisia. Cells tubular, catenated in one or two alternating 

 series, the aperture round and terminal. 



27. NoTAMiA. Cells ovate, geminate, opposite, the aperture 

 suhterminal. 



28. HiPPOTHOA. Cells elliptical, linked together, the aperture 



superior and lateral. 



29. Anguinaria. Cells spathulate, separate, the aperture lateral. 



Family III. TUBULIPORIDiE. 



Polypidoms calcareous, variable in shape but never confervoid : 

 cells tubular, rowed, rising from a base and projecting, the aperture 

 terminal and non-operculate. 



30. TuBULiPORA. Cells tubular, rowed, with distinct parietes. 



31. DiscoPORA. Cells tabular, quincuncial, confluent. 



Family IV. CELLEPORIDiE. 



Polypidoms calcareous or membrano-calcareous, lohed, ra- 

 mous or crustaceans, formed of an aggregation of cells disposed 

 usually in quincunx : cells utricular, in juxta-position, with a 

 contracted terminal aperture, often covered ivith an operculum. 



32. Cellepora. Polypidom lobed or raraous ; cells heaped. 



33. Lepralia. Polypidom crustaceous ; the cells in a single lay- 

 er, rowed, subaltcrnate, with a contracted orifice. 



