BIOLOGICAL STUDIES OX CORYMORPHA. 295 



affairs at the end of 56 hours is shown in the following table, in 

 which the serial numbers represent stages in the development 

 arbitrarily sel for purposes of classification. I'mler each 



of tin - appear- tin- number (l) of proximal hvdranths in that 

 1'ipment on the ligatured segments, (2) of proximal 

 h\ 'Ira nth- on non-ligatured segments, and (3) <>f di-tal h\ drain hs 

 on non-ligatured -e^ments. 



TAHLE I. 



I '.. -tages I 234567 I'-t.iU. 



i.l o 5 3 5 5 i i 



4 4 5 <> i i o 



ist.) 3 2841.'! Ji 



In -pile of i he individual variation represented by thr-e tunr 

 tin 1 . ncy in the proximal etui '< hydrant/: 



rapidly on the ligatured segments, and alii: >af>idly 



on tin- latter as the distal hydranths on non-li^atur 



V. 



Although < 'orymorpha responds proximally like 'I'n'mlaria \\hen 

 nenta of tin- column are ligatured as al>o\e, there i- an im- 

 1 1- M taut diltereiH e iii its response at 

 tin- li^at me, namely, in the rapidity 



\\itli \\hich h \dranths are formed 

 immediaieU below it. In Tubit- 

 Itiria, a hydranth very rarely ap- 

 peals immediate!) brlow the liga- 

 ture, and then oiil\ alter the lapse 



.'t inaii\ days. In i>rf>lia, 



on the ei.ntraiA, hydranth form 

 ieadil\ and fre<ineiitl\ in thi- A, 

 position. 



That a lixdranth >hotild arise 



\J 



immediately below a ligature in 



yinorpha mii;ht \n- antii'ipated 

 n the occasional occurrence of 

 Mich monsters as that sh ( ,\\n in \^ / 



l ; iu. 16, \\hich represents a re- 



FIG. 16. 



generating Moment ol the column. 



The proximal ludranth ^belo\\ the'an^le) is not so far along as 



