ON THE CAUSE OF AUTOTOMY IX TUBULARIA. 



393 



act as an effective block. I refer to the accumulation of a 

 gelatinous mass between the pi-ri-arc and coenosarc which begins 

 to be secreted by the coenosarc soon after it pulls away from its 

 contact with the perisarc. The secretion is perhaps of the nature 



// Y /). 





^ c.c. 



. 







</.< . 



!< pi. -entin- tin- oni'litim; i> in a tubularian. Such om- 



ilitioii< .in- present in J':< ! ':iLiriii which have licen k.-pt -tiinulatoil tn/m one to 

 several li.-ins. //\ .' h\.li.mt!i; B.D.=break in .li-epinient; C.C. =c<rnosarc 

 "i linily \\.ill; 1>. --deliii- leit 1-v eiii ulalini; current; (./'. -.nelatinnti- n 



:vity of body; /'. |ifii 

 -ti.'ii.^ly o>tur.. .1 ="ncck." 



of iiKilcrial for .1 iir\\ pn i-.ii'r. .uul as noU-d 1>\' < lodlcu -ki it 

 i- mi r mi act \\ ith \\atcr. The accumulatii >n and hardening 



