Vol. XXII. January, 1912. No. 2 



BIOLOGICAL BULLETIN 



()\ THE BEHAVIOR OF 

 TUBICOLOUS ANNKLIDS. 



111. 



(HAS. \V. HARGITT. 



lii two earlier pa|>ers dealing with the general subject of the 

 . i\ i< 'i <il tube-dwelling annelids the writer endeavored t<> i;i\e 

 in -onie ilt i. ul .in account of experiments and observations made 

 upon several species of these worms available at Wood- 1 lole. and 

 in. Hi ni.ilK made reference to a few observations upon one f the 

 Viple- -pei ies, Protula protula. During a recent occupancy of 

 the sniiili-oiiiaM table at the Naples laboratory occa-ion wa- 

 taken i" i xiend these observations to several otlu-r -peeie-. and 

 to in. ike .1- i ritical a comparison as might be practieable ol tlic 

 I K h.i\ ic n M| i IK- la Her \v ilh that ol the \\oods HI >lr -] >< < ii -. 1 1 

 will IK- noted that in the present account less attention ha- been 

 vjv en to detail- of time reaction, various stimuli, etc., than before, 

 and that beha\ ior in relation to light has been enipha-i/ed. Thi- 

 \\.i- deemed the more important since it was upon ihe-e ^peeie- 

 th.it -nine o| the earlier work concerned with animal heliotropism 

 \\a- done. A- ma\ be recalled, my \\ork alread\ ment i< >m <! 

 '"'. '09 . did not tend to confirm these \ie\\-; ,unl it \\a- \\ith 

 a \ie\\ to te-t them \\\ a repetition of tin- experiment-^ that 1 

 underiook to i' \.miine the subject. In the follow in- a(enmt. 

 will be found the results and conclusions which my ob>er\ atioim 

 ha\ e -eemei 1 to warrant . 



The following are the species which ha\e been n-ed: Protula 

 protnhi, IJydroides pcctinata (Serpula nncinat<D, Ponuitcxcrn^ 

 tru/uctcr, and Spirographis spallanzanii. The experiment- were 

 carried on from January I to April 15, a period of three ,md one 

 half month-. Particular pains were taken to vary the experi- 



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