264? POLYZOA INFUNDIBULATA. 



Family ESCHARID^. Polypidoms multiform, composed of ob- 

 long suh-qiiadrangidar cells, disposed in semi-cdterncding series ; the 

 cells conjunct, horizontal to the plane of axis, ivith a suh-tei'minal 

 or lateral aperture, usually covered with an ovarian cap)sule. 



Celltjlaria. Polypidoms dichotomously divided, the segments 



narrow, composed of one, two, or three rows of oblong cells, 



whose apertures open on the same plane. 

 Flustra. Polypidoms foliaceous or membranous, composed of 



several series of oblong-quadrangular cells on two planes, or one 



only. 

 EscHABA. Polypidoms membrano-calcareous, frondescent, the 



cells immersed, in a double layer placed back to back, like the 



cells in honey-comb. 

 Retepora. Polypidom calcareous, frondescent, netted ; the cells 



on the upper side only. 

 Salicornaria. Polypidom dichotomous, with jointed cylindrical 



branches j cells immersed, rhomboidal. 



* * * Polypidoms sponge-like, fleshy, polymorphous ; the cells 

 irregular in disposition, immersed, with a contractile aperture : no 

 external ovarian capsules. Halcyonellea, Ehrenh. Corall. 153. 

 Alcyonidium. Polypidoms fleshy, lobed, erect. 



CrcLOUM. Polypidom encrusting ; the ova in circular clusters. 

 Sarcochitum. Polypidom encrusting ; the ova scattered singly 

 throughout. 



* * * * Polypidoms confervoid, horny, fistular ; the polype-cells 

 free. Vesioularina. 



Family VESICULARIAD^. Body of the polype separate from 

 the parietes of the cell, which is deciduous. 



Serialaria. Polype-cells uniserial coalescent. 



Vesioularia. Polype-cells uniserial, disjunct. 



Beania. Polype-cells scattered, solitary. 



Valkeria. Polype-cells clustered, irregular, the Polypes with 



eight tentacula. 

 Bowerbankia. Polype-cells clustered, irregular, the Polypes 



with ten tentacula. 

 Farrella. Polype-cells clustered, irregular, the Polypes with 



twelve tentacula. 



Family PEDICELLINiE. Body of the polype adnate to the cell. 

 Pedicellina. The only genus. 



