6 
CLASS ZOOPHYTA. 
Animals of radiate structure; of gelatinous or fleshy 
substance ; more or less column-shaped ; having, in general, 
one end permanently attached or temporarily adherent to 
foreign bodies ; the other end forming a flat disk surrounded 
by one or more circles of tentacles, and pierced in the 
centre by a mouth opening into the digestive cavity ; 
furnished with offensive weapons in the form of capsules 
imbedded in the tissues, each of which encloses a projectile 
poisoning dart ; possessing no special organs of sense. 
OKDER ACTINOIDA. 
The visceral cavity inclosing the stomach, and divided 
into compartments by perpendicular partitions of membrane 
which support the reproductive organs ; germs ejected 
through the mouth. 
SUB- ORDER ACTINARIA. 
Tentacles twelve or upwards, rarely warty ; membranous 
partitions sometimes simple, sometimes depositing solid 
calcareous plates, which, with the surrounding walls, con- 
stitute the coraUum. 
TRIBE I.— ASTR^ACEA. 
Tentacles many, in imperfect series, or scattered ; coral- 
lum (when present) calcareous, consisting of cells containing 
many radiating plates; the plates prolonged outward beyond 
the cells which enclose them. (N.B. No known British 
species of this Tribe deposits a coralhim.) 
TRIBE II.— CARYOPHYLLACEA. 
Tentacles many, in two or more series ; mostly increasing 
by lateral buds ; generally depositing a coi'aUmn, which is 
invariably calcareous, and many-rayed. 
