B 



FIG. 100. 



. 100. Halistemraa tergestinum. A, the entire colony ; B, a single group of zooids ; 

 ex. ccenosarc; dz. dactylozooid ; hjih. hydrophyllium or bract; net. nectocalyx or swimming- 

 bell : ntc. battery of uematocysts ; p. polype: pn. pueuinatophore or float: . '. sporocysts ; 

 t. tentacle. (After Glaus.) 



