26 

 thnt I re.Ted i- the laborr.tory rorrer.r)ond ^^ith those found 

 by Professor Brc^l-s a-d I he.ve pc doubt that they are the 

 sp."-e s'^ecies. The '^rirrary and jccoMdary tentacles arise 

 frc" the ca-e level so that they rray be said to ecrstitute 

 one -hcrl. The five rrlrary tentacles, ho'.vever, are lenper 

 and Drc.iect forward; v/hile the secondary ot-cs a.^e shorter 

 a-d extend backvard. The tentacles are veil ar-ed with thread 

 cells v.'hich are arranged around the tentacles in clusters 

 at short distances frcr each other, frc" one end of the ten- 

 tacle to r.he other. These f^rouns of thread cells\becore 

 closer topether as the distal end of the tentacle is an- 

 nrcached. 



A thin delicate ^erisarc is secrete^ early i?' the devel- 

 crTrent of the hycra'-th. It adheres closelv t^ the root and 

 ster. It deer not extend the e^^tire lenpth of the ster; 

 but stons a little distance below the 'ircle of tentacles. 

 In Flpure 31 a nrlyn is ^r\\- i" v.-hich the ccencsarc has re- 

 tracted for some distance in one of the hydrorhlra and 



