77 

 vplornert of the hydrcrth. 



Professor BrcclT. ciosrribcs r.nd fif^uroc i^ tho rlr.rnla 

 of Eutira an octodornal adhesive flared. It oocurs after 

 the endoderr. a'^d the digestive cavity are f or'^ed , ard l^efore 

 the a-n-earance of the ^outh, as ap ectoderra" inva.Pinati on 

 at the sDall e-d of the -tlanula. In Tiirritojsis no such 

 special ojtan of attachrert in found. The larva rrrbably 

 beco'^es fixed by a secretior extruded frc^ the eetoderr. 

 cells alonp the v;hole lenj^th of itr, body. 



DEVELCFFEKT CF TKF HYDFAI'TH. 



Shortly after the Ir.rva becor.es attached a bud re\o'[o^'!>, 

 usually at about the co'-tre of the root, rhich is the begir- 

 ^inF of the first hydra'^th. Four si-all nrc.iectirris ar-^ear 

 early arourd the distal '-art of th*-' bud; these rin later 

 forr the first circle of te-tacles. At this ti-e nc -outh 

 has yet developed. /Jyourr rolyr i- this stape of develon- 

 Fert is rhov"- i'^ Tirme 37. The hydra-th bud rertirues to 

 pre- tallrr arc aftfr a fe- hours r seccrd rhorl of ter- 



