144 THE ANATOMY OF INVERTEBRATED ANIMALS. 



8 



II 



Fig. 30.— Coralli>/?n rub7'um (after Lacaze-Duthiers i). 



I. The end of a branch with A, B. C, three anthozoOids in different desrees of ex- 

 pansion ; k, the mouth ; a, that part of the coenosarc which rises into a cup 

 around the base of each anthozoSid. 



Porrion of a branch, the coenosarc of which has been divided loncritudinally and 

 partia ly removerl ; 5, B', B'\ anthozooids in section; 5, anthozoOid with ex- 

 panded tentacle^^; k. tnoutli ; m, irastric sac ; ?:, its inferior odee; j, mesenteries. 



B\ anthozoSid retracted, with the tentacles {d) drawn back into the intormesenteric 

 chamber-!; c. orifices of the cavities of the inva^inated tentacles ; e, circum-nral 

 cavity ; 6, the part of the body which forms the projecting tube when the antho- 

 zoQid is expanded : a. festooned edges of the cup. 



B"^ anthozoSid, showing the transverse sections of the mesenteries. 



A^ A. coenosarc, with its deep longitudinal canals {/ ), and superficial, irregular, 

 reticulated canals {h). P, the hard axis of the coral, with longitudinal grooves 

 {g) answering to the louLMtudinal vessels. 



III., IV. Free ciliated embryos. 



1 " Ilistoire Naturelle du Corail," 1864. 



