86 THE EVOLUTION OF CONTINUITY 



of the mesenteries that the reproductive organs are formed. 

 The number of septa varies in different types of sea-anemone, 

 though twelve is a common one — this statement referring 

 to the " complete " septa which form the chambers ; but 

 " incomplete " septa are also present (Fig. 23, A) which 

 do not stretch across to meet the oesophagus. The chambers 

 of the sea-anemone are roofed over by a continuation of 

 the cell-layers of the body-wall, but fine pores in the septa 

 allow a measure of direct communication. The endoderm 

 lining the chambers is well provided with cilia which main- 

 tain a circulation of the body contents. One sea-anemone, 

 unless very rarely, comprises the whole Individual, and 



wi 



Fig. 22. — a, diagrammatic vertical section of sea-anemone 

 drawn so as to show relations of oesophagus, stomach, septa, 

 and mesenteries, t, tentacles ; m, mouth ; o, oesophagus ; 

 it, stomach ; p, septa ; and /, mesenteries. B. transverse 

 section at level of oesophagus, c, similar section below the 

 level of the lower end of the gullet, ec, ectoderm ; era, endo- 

 derm ; me, mesoderm ; o, oesophagus ; ic, interseptal 

 chambers ; /, edges of mesenteries. 



produces, multiply be it noted, both male and female sexual 

 organs. 



Possibly these few facts regarding the structure of the 

 Sea-anemone have already enabled the reader to recognise 

 in the organism the multiplication of Continuously Zooidal 

 Continuity, and that its structural plan is the logical sequel, 

 in the ascending scale of Continuity, to that of the Con- 

 tinuously Zooidal Individual. 



The cross-section of Adamsia, in Pig. 23, shows dis- 



