164 



ZOOLOGY 



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 



C7* 



Fig. 122. — Physalia : the living animal floating on the surface of the sea. er. crest ; p. polype ; 

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



Halistemma, but the female apparently becomes detached as a 

 free medusa. 



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

 of proportionally immense size are situated at the proximal end 

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

 zooids (B), each group containing a polype (n) with its tentacles (i), 



