52O 



RADIATES : POLYPS. 



South Carolina and Georgia ; R. Danes, Verrill, on the 

 Atlantic coast of South America ; and R. pcltata, Verrill, 

 near the mouth of the Mississippi. 



The Sub-Order Gorgonacea embraces polyps which 

 are cylindrical, short, connected laterally, and which se- 

 crete a solid central axis. It contains Fig. S09 . 

 seven families, -- Gorgonidae, Plexauridae, 

 Primnoidae, Gorgonellidae, Isidas, Coralli- 

 dae, and Briaridae. The forms are exceed- 

 ingly varied, and often extremely delicate 

 and beautiful. They abound in tropical 

 seas ; some species are found in temperate 

 zones. Fig. 509 belongs to Gorgonellidas. 



Fig. 511. 



Red Coral, C. rubrum, Lamk. 

 Single polyp enlarged. 



RkipidogorgiaJIdbeUum, Val. 

 Portion of a large frond. 



Verrucella geniinacea, Val. 



Fig. 513- 



Red Coral, Corallium 

 rubrut, Lamarck. 



Priinnoa myura, 

 M.-Edw. 



Organ-pipe Coral, Tulipora 

 syringa, Dana. 



