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ALLAN HAXCOCK PACIFIC EXPEDITIONS 



VOL. 4 



PLATE 19 



Fig. 1. Perigonimiis gracilis 



Portion of colony showing branching and hydranths. 



Fig. 2. Perigonimus robustus 



Portion of colony showing medusa-bud. 



Fig. 3. Hydractinia rugosa 



Portion of colony showing nutritive zooids, female 

 generative zooids, and spines. 



Fig. 4. Clytia macrocarpa 



Colony showing mode of branching, hydrothecae and 

 gonangium. 



Fig. 5. Lovenella rugosa 



a. Two hydrothecae, 



b. Gonangium. 



