18 



POLYZOA. 



** Branching. 



C. ramulosa, 

 Skenei. 



Family YIII. Eschaead^. 



Eschar a (Ray). Cells on both surfaces of the 

 expansion, immersed, and coalescent. 



E. foliacea. Fig. 28 ; n. s. and mag. 

 cervicornis. 



Retepora (hdimk.). Leafy, reticulated ; cells im- 

 mersed, on one surface only. 



K. cellulosa. Fig. 29 ; n. s. and mag. 

 Beaniana. 



■^A:fCi 



29 



30 



Sub- Order III. CTENOSTOMATA. 



Polyzoary sponge-like, flesliy, irregular in 

 sharpe; cells immersed, with a contractile 

 orifice Alcyonidiadae. 



Polyzoary plant-like, horny, tubular ; cells 

 free, deciduous ; the extremity flexible and 

 invertile .... Vesiculariadcs 



