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MANUAL OF ZOOLOGY 



SECT. 



B 



FIG. 48. Halistemma tergestinum. A, the entire colony ; B, a single group of 

 zooids ; cce. coenosarc ; dz. dactylozooid ; hph. hydrophyllium or bract ; net. 

 nectocalyx or swimming-bell ; ntc. battery of nematocysts ; p. polype ; pn. 

 pneumatophore or float ; s, s'. sporocysts ; t. tentacle. (After Claus.) 



