ACTINOIDA. 



25 



ringed stalks set irregularly, or in whorls: egg- 

 vesicles scattered, producing medusa-like embryos. 



* Stem simple. 



C. volubilis. Fig. 36 ; n. s. and mag. C. intertexta. 

 Integra. syringa. 



lacerata. parvula. 



Isevis. caliculata. 



serpens. 



** Stem of many parallel tubes. 

 C. verticillata. C. dumosa. 



Order II. ACTINOIDA. 



Tentacles 12 or upwards, rarely warty, per- 

 forate at the tip ; radiating partitions of cavity, 

 often depositing solid calcareous plates, which 

 make a corallum Actinaria. 



Tentacles 8, warty or plumose, the branchlets 

 perforate ; often depositing a corallum, which is 

 calcareous, or horny, rarely siliceous .... Alcyonaria. 



