BOOK SECOND. 
POLYPI. 
CLASSIFICATION. 
§ 24, 
Tue Poxyer are either immovably fixed, or seated on a locomotive 
foot. Their soft body is in part enveloped by a solid support, the 
polypary. ‘This last is often, for the most part, horny or calcareous; and 
by it numbers of these animals are united into greater or less groups. The 
central mouth is always surrounded by a coronet of contractile tentacles. 
The digestive apparatus is organized after two different types, upon which 
is based a division of these animals into two orders. The sexual appara- 
tus is always without copulatory organs. 
ORDER I. ANTHOZOA. 
The digestive canal is without an anus, and opens into the general 
cavity of the body. 
Famity : Mapreporina. 
Genera: Oculina, Millepora, Madrepora, Caryophyllia, Astraea, Desmo- 
phyllum, Maeandrina, Monticularia, Agaricia, Favia. 
Famity: Gor@onrna. 
Genus: Gorgonia. 
Famity: Isrpga. 
Genera: Corallium, Isis. 
Famity: Tusrporina. 
Genus: Tudipora. 
Famity: ALcyonrna. 
Genera: Alcyonium, Lobularia, Alcyonidium. 
Famity: Pernnatoina. 
Genera: Veretillum, Pennatula, Vir gularia. 
