144 THE ANATOMY OF INVERTEBRATED ANIMALS. 



Fig. SO. — GoraUi>nn nibrum (after Lacaze-Duthiers 1 ). 



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

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

 around the base of each authozo5icl. 



II. Portion of a branch, the coenosarc of which has been divided longitudinally and 

 partially removed; B, B\ B", anthozooids in section; B, anthozo8id with ex- 

 panded tentacles; k, mouth ; m. gastric sac ; i, its inferior edge; j, mesenteries. 



B\ anthozooid retracted, with the tentacles (d) drawn back into the intermesenteric 

 chambers; c, orifices of the cavities of the invaginated tentacles ; e. circura-oral 

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

 zo6id is expanded : a. festooned edges of the cup. 



B" ', antliozooid, showing the transverse sections of the mesenteries. 



A, A, coenosarc, with its deep longitudinal canals (/), and superficial, irregular, 

 reticulated canals (ft). P, the hard axis of the coral, with longitudinal grooves 

 (g) answering to the longitudinal vessels. 



III., IV. Free ciliated embryos. 



i " Histoire Naturelle du Corail," 1864. 



