B 



FIG. 106. Halistemma tergestinum. A, the entire colony; B, a single group of zooids ; 

 CQ. cu'iiMsaiv : </:.. dactylozooid ; hph. hydrophyllium or bract; net. nectocalyx or swimming- 

 bell ; ntc. battery of nematocysts ; y. polype ; pn. pneumatophore or float ; s. s'. sporocysts ; 

 t. tentacle. (After Claus.) 



