CLASS IV.— POLYPL 
In this class there are tentacula, which surround the mouth. 
Most of the genera propagate by off-shoots, as well as by eggs. 
It includes three orders, viz. — - 
Class. Order. 
( Polypi carnosi. 
Polypi . . < Polypi gelatinosi. 
V Polypi polypiferi. 
ORDER I.— Polypi Carnosi* 
Called also fixed sea-nettles. They have a fleshy envelope, and 
are generally fixed to some submarine object, but occasionally free. 
Genus. 
Actinia . . 
Lucernaria 
Subgenus. Example of Species. 
f l. Actinia, prop. .... Ac. senilis, L. 
2. Thalassianthus .... Thai, aster, Ruppel. 
3. Discosoma D. nummiforme, Id. 
C 4. Zoanthus Hydra sociata, Gm. 
• • L. quadricornis, Mull. 
ORDER II. — Polypi Gelatinosi. 
Are without any general envelope, and are gelatinous. Their 
body represents a mere bag. 
Genus. Example of Species. 
Hydra, Lin . . . H. viridis, Trembley. 
Corine, Gcertner Tabularia coryna, Gm. 
Cristatella C. mucedo, Cuv. 
Vorticella 
Pedicellaria See Muller, ZooL Dan. xvi. 
P 
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