ON THE BEHAVIOR OF TUBICOLOUS ANNELIDS. 



6 9 



form <>r aspects of the tubes is noteworthy. In my early paper 

 u.i- -lunvn a figure which made this very graphic. Xo less than 

 in tin- case of Hydroides the tubes of Protuhi show the record of 

 erratic behavior in very striking manner. i.Cf. '09, pp. 180- 

 [83. I Miring early life these tubes usually adlu-rr very Mruiisjy 

 and closely to the base of support; but in maturity they ohm 

 in< line in-.n- or less toward the vertical, though in a ratlur sinuous 

 fir - 1 lira I din-, i ion, or may even mil about rarh otlu-r and assume 



l-ii.. i -li.,u . colony of Protttla. with Spirographis'w tin- 



I li>- pi' : of the tubes is very m.ir kc-<l. 



p. tit. 



a do\\nu.ini a-|>ivt. This may be seen nm-t -trikin^K' in the 

 l.ii-r colonies i these creatures al\\a\^ ]>IVM-IH in tin- >how 

 aijiiaria ot' tin- lal IOIMI ory, where may .il>f> br M-i-n to biM dtCft 

 tlu- marked \ariability as to tubular brhaxior. Something of 

 tin- i^ ^iMpliicallN >ho\vn in 1'i--. I and ;-,. ropird li-oin |)lnto- 



