144 



THE ANATOMY OF INVERTEBRATED ANIMALS. 



Fig. 30.— Corallium rubrum (after Lacaze-Duthiers J ). 



I. The end of a branch with A, B, C, three authozo5ids in different desrees of ex- 

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

 around the base of each anthozo5id. 



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

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

 panded tentacles; Jc. mouth ; m. gastric sac ; ?', its inferior edge; j, mesenteries. 



B'. anthozooid retracted, with the tentacles (d) drawn back inlo the intermesenteric 

 chambers; c. orifices of the cavities of the invaginated tentacles ; e, circum-nral 

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

 zooid is exDanded : a. festooned edges of the cup. 



B", anthozooid, showing the transverse sections of the mesenteries. 



A, A. ccenosarc, 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 longitudinal vessels. 



III., IV. Free ciliated embryos. 



i " Histoire Naturelle du Corail," 1864. 



