hfih 



FIG. 54. Halistemma tergestinum. A, entire colony; B, a single gToup of zooids. 



osarc; dz, dactylozobid ; /////, hydrophyllium or bract; net, nectocalyx or swimming 

 ntc, battery of nematocysts; p, polyp; pu, pneumatophore or float; s.s , sp 

 /, tentacle. (After Clans, from Parker and Harwell's Text-book.) 



