B 



Fio. 120. Halistemma tergestinum. A. the entire colony ; B, a single group of zooul- 

 cce. coenosarc ; dz. dactylozooid ; hph. hydrophylliura <T luart ; net. nectocalyx or swim 

 ming-bell ; ntc. battery of nematocysts ; p. poly|M- ; it. pneumatophore or float ; s., s . 

 sporocysts ; (. tentacle. (After C'laus.) 



