MANUAL OF NATURAL HISTORY. 347 



lobed ; cells long and tubular, with a round, 

 prominent, unconstricted aperture. 



14. Family. — Confer void Ascidian-Polyps (Crisii- 



dse). Polyzoarj- plant-like, dichotomously 

 branched, jointed; cells tubular, in one or 

 two series, with the circular apertures alter- 

 nately looking to opposite sides. 



III. SUB-ORDER.— Fringe-mouthed Ascidian-Polyps 

 (Ctenostoniata). 



Aperture of cell with a more or less well-marked 

 fringe of setae around the margin when the animal 

 is protruded. 



15. Family. — Vesicular Ascidian-Polyps (Vesicu- 



lariidse). Polyzoary slender, plant-like, horny, 

 fistular ; aperture of polyp-cell fringed ; body 

 of polyp separate from walls of cell, which 

 is deciduous. 



16. Family. — Pedicellate Ascidian-Polyps (Pedice- 



linidse). Polyzoary pedunculate, clavate, ris- 

 ing from a filiform, creeping shoot ; body of 

 polyp adnate to cell. 



IY. SUB-ORDER.— Fleshy Ascidian-Polyps 

 (Haley onellea.) 



Polyzoary sponge-like, fleshy, polymorphous ; 

 cells irregular in disposition, immersed; aperture 

 contractile ; no ovarian capsules. 



17. Family. — Sponge-like Ascidian-Polyps (Alcyo- 



nidiidse). Polyzoary fleshy, lobed ; cells 

 with fibro-corneous walls ; aperture terminal, 



