152 



ZOOLOGY 



SECT. 



of grapes of a deep blue colour, and long retractile tentacles, 

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

 pn. pneumatophore. (After Huxley.) 



Halistemma, but the female apparently becomes 'detached as a 

 free medusa. 



In Dipliyes the float is absent. Two swimming-bells (Fig. 110, m) 

 of proportionally immense size are situated at the proximal end of 

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



