128 



COLLEGE ZOOLOGY 



ORGAN PIPE CORAL Tuhipora 



SEA FAN Gorgonia 



PRECIOUS CORAL 

 Corall'iiim 



BRAIN CORAL 

 Menandrina slnuosa 



Figure 66. Some interesting types of coral. Note that some of the precious coral polyps are 

 expanded as they are when feeding. 



Class 3. Anthozoa. Corals, sea anemones, etc. 

 Solitary or colonial; polyps only, no 

 medusae; distal end, an oral disk; 

 gullet well developed; gastrovascular 

 cavity divided by mesenteries; meso- 

 glea cellular. 

 Subclass 1. Alcyonaria. Corals, sea pens, etc. 

 Colonial; skeleton present; 8 

 pinnate tentacles; 8 mesen- 

 teries; 1 siphonoglyph, ventral. 

 Exs. Corallium, precious coral 

 (Fig. 66), Pcnnatula, a sea 

 feather (Fig. 66). 

 ^•ubclass 2. Zoantharia. Sea anemones, true 



corals, etc. Solitary or colonial; 

 with or without skeleton; not 8 

 tentacles. Exs. Metridium (Fig. 

 61), Astrangia. 



SELECTED COLLATERAL 

 READINGS 



Allee, W.C. The Social Life of Animals. Nor- 

 ton, New York, 1958. 



Berrill, N.J. "The Indestructible Hydra," Scien- 

 tific American, 197:118-125, 1957. 



