Chap. IX.] 



D ENDROPH YLLIA. 



285 



largely composed of foreign material ; nor is there any 

 complete internal skeleton. The cuticle may be soft 



.b'ig. 118 c. Coral. Dendrophyllia ramosn, 



and ciliated, as in the Turbellaria, or become very 

 firm and appear to be formed of a chitiiious substance, 

 as in the Nematoidea, or still more in the Rota- 

 toria, where it maybe jointed and have muscles inserted 



