42 



BRITISH HYDROID ZOOPHYTES. 



As to the advantages to be derived from 

 an association of crab and polypites, the 

 latter, doubtless, partake of the crumbs that 

 fall from the rich man's table, and also feed 



a 



Fig. 7 Hydractinia, echinata, Fleming. Enlarged. 



(a). Alimentary polypite. 



(b). "Select" polypite bearing the "Reproductive" buds 

 containing ova. 



(c). Worm-like body ("tentacular filaments," Hincks), 

 sometimes called dactylozooid. 



(d). Enlargement of head of the same. 



(e). Horny spine of "crust." 



