52 CXELENTERATA AND 



gemmation and ova. Hermaphrodite. Eggs develop in- 

 ternally. Abundant everywhere at low tide. 



A. marginata. 



ACTINOLOBA WITH BODY CONTRACTED. 



Bunodes. Body with thick walls, covered externally 

 with warts. Tentacles short, not numerous, in four rows. 



B. spectabilis. 



Polythoa. Polyps in clusters connected by living cceno- 



sarc. Attached to shells inhabited by hermit crabs, worms, 



etc. P. parasitica. 



Tealia. 1 Solitary, tentacles in many series. Base large. 



Body bright red, smooth; when retracted, flat. 



T. crassicornis . 

 nodosa. (?) 

 A. II. 



Lophohelia. Colonial, branched. Polyps irregularly al- 

 ternate, widely separate. Calycles cup-shaped, slightly 

 protuberant. Axis solid, zigzag. Deep water. 



4 L. prolifera. 



* Urticina. 



