BIOLOGICAL STUDIES ON CORYMORPHA. jSo, 



development). Such protuberances and Y-shaped figures are 

 found in nature only in the most exceptional cases, where they 

 probably ari-e in re-ponse to the same conditions that bring 

 tin-in forth in the laboratory. To present these conditions with 

 -iithcient ftillne-s, I must refer briefly to otlu-r abnormal forms 

 that lia\t- <,|i. -n appeared in neglected aquaria. 



It \\a- i-it.-n difficult, in warm weather, in tin- absence of 

 running \vater, to prevent the growth of bacteria in the di>hes 

 in which fre-hly collected polyps were placed, ("nder the in- 

 lluein Mientative changes induced by the-e condition-, the 



hyiranth- \\ould cast their large proximal tentacle- and medu-i- 

 u- peduncles, the distal tentacles would be ab-orbcd. and the 

 (oluinn uoiild come rapidly to be surmounted by a in less 



rounded ina-s of (iue that might show two or three knobby 



.nl.iiities. The columns were alle. i. d in a much ! 

 it .it all. In fact it is quite easy to avoid these ditlicultie- alto- 

 gether by removing the hydranths as soon as the polyps are <<.!- 



d. This fact is doubtless due to the relatively lar^e ma 

 pioi.,p|.i-ni in, ami the greater differentiation of the ti--iir- of the 

 hydranths. 



I pon the reduction of the hydranths to the knobby ma- 

 ju-i meiiiioned, and the remo\'al of the delui- composed of di-- 

 inie^raiing tentacles ami medusa' with their peduncles, the 

 < iia \\oultl disappear, fermentative processes would lead to 

 t he Mib-t it ut ion, for the original hydranths, of \ at i> >u* monstn -11- 

 fonn- double ludrantlis. hydranths with double or triple 

 proboscea in \ai\in^ dt ^rees of independence, combinations of 

 hydranths with \ai\iiu numbers of probosces, etc. These phe- 

 nomena indicated i he breaking up of the original single ph\-io- 

 al -\Mem into several, the first sign of this multiplication 

 appearing in the irregular form of the terminal mass of tissue. 

 I ^ularit\ \\a> the center of a budding proce--. And 



\\ ithoiit la\ in 14 an\ empha-i- mi the manner of it- initiation. -ach 

 budding process ma\ In- i'om|ian-il direi'tK \\ilh the prore b\ 

 \\hich the >tem i> |iroduced in the Y->haped ti.^nre- \\ e ha\e been 



considering. 



In one imporianl respect lhe-e budding processes n-emble each 

 other; the\ -land, n.inieh . for tl eertain t !i-or^ani/.ation I how 



