18 



ZOOPHYTA. 



projectile poisoning dart: no special organs of 

 sense : no distinction of sex. 



Internal cavity simple ; increasing by germs 

 growing out from the sides Eydrdida. 



Internal cavity inclosing the stomach, and 

 divided into compartments, by radiated parti- 

 tions which have reproductive functions ; germs 

 ejected through the orifice of the cavity . . . Actino'ida. 



23 24 



Order L HYDBOIDA. 



Deciduous germs growing from near the base 

 of tentacles, and naked ; animals either naked, 

 or inclosed in a horny, tubular envelope (coral- 

 lum) Tuhulariadce. 



Egg-germs inclosed in vesicles ; animals in- 

 creasing by permanent lateral buds ; inclosed 

 in a horny envelope ; polypes seated in cup-like 

 cells. 



Cells sessile Sertulariada. 



Cells on foot-stalks Campatmlariada, 



