CATALOGUE 



POLYPES AND THEIR CORALS. 



Class POLYPES or CORALLIARIA. 



Mouth central, surrounded by tentacles, without 

 any distinct vent; tentacles tubular and placed in a 

 circle, so as to communicate freely with the visceral 

 cavity. 



Body hollow, consisting of a single cavity, all the 

 parts communicating with each other and with the 

 exterior. 



The organ of generation internal, and placed in the 

 general cavity. 



Marine. 



Coralliaires, § 1. Cnidaires, Milne-Edw. 8f Hainie, Cwalliaires, i. p. 93. 

 Cnidaria or Polypi, Verrill, Proc. Essex Institute^ 18G5, p. 19. 



The following arrangements have been proposed : — 



M. de Blainville, article Zoophytes, Diet. Sci. Nat. Ix. 18,'JO, and 

 Manuel d'Actinologie, 8vo, 1834, as follows : — 



Classe III. Les Zoantiiaires {Zoantha). 

 Fain. I. Les Zoantiiaires mous ou Actinies. 

 Fam. II. Les Zoanfhaires coriacSs: Zoanthus &c. 



F;im. III. Les Zoanthalrcs pierreux = M.s\drcpora, Linn. : 1. Les Madrephyllies, 

 '2. Les Unxdrastres, 3. Les Madrepores. 



