B 



FIG. 120. Halistemma tergestinum. A, the entire colony ; B, a single group of zooiib 

 coe. coenosarc ; dz. dactylozooid ; hph. hydrophyllium or bract ; net. nectocalyx or swim 

 ming-bell ; ntc. battery of nematocysts ; p. polype ; pn. pneumatophore or float ; s., s'. 

 sporocysts ; t. tentacle. (After Claus.) 



