344 MANUAL OF NATURAL HISTORY. 



I. ORDER, — Makine Ascidian-Polyps 

 (Infundibulata). 



Polyps compound, mouth surrounded with ciliated, 

 filiform, retractile tentacles, which form an uninter- 

 rupted circle ; ova ciliated. Marine. 



I. SUB-ORDER. — Lip-mouthed Ascidian-Polyps 



(Chelostomata). 



Aperture of cell filled with a thin membranous or 

 calcareous velum, with a crescentic mouth, provided 

 with a moveable lip. 



I. TRIBE. — Jointed Ascidian-Polyps (Articulata). 



Polyzoary divided into distinct portions or joints, 

 by flexible articulations. 



1. Family. — Chain-like Ascidian-Polyps (Cateni- 



cellidse). Cells disposed in a single series, and 

 connected by flexible joints. The cells are 

 horny, and arise one from the other by a 

 short continuous tube, all facing the same 

 way, and forming dichotomously divided 

 branches. 



2. Family. — Salicornian Ascidian-Polyps (Sali- 



cornariidse). Cells disposed in a double or 

 multiple series, around an imaginary axis, 

 forming cylindrical branches of a dichotom- 

 ously divided, erect polyzoary ; branches of 

 polyzoary with distinct articulations. 



3. Family.— Cellular Ascidian-Polyps (Cellularii- 



dee). Cells disposed in a double or multiple 



