164 



ZOOLOGY 



SECT. 



sometimes several feet in length and containing batteries of 

 stinging-capsules powerful enough to sting the hand as severely 

 as a nettle. The male reproductive zooid remains attached, as in 



**-. 



FIG. 122. Physalia : the living animal floating on the surface of the sea. cr. crest ; p. polype ; 

 pn. pneumatophore ; t. tentacle. (After Huxley.) 



Halistemma, but the female apparently becomes detached as a 

 free medusa. 



In Diphycs the float is absent. Two swimming-bells (Fig. 123-4, m) 

 of proportionally immense size are situated at the proximal end 

 of the coansarc, and are followed by widely-separated groups of 

 /ooids (/?), each group containing a polype (n) with its tentacles (*'), 



