KIGHT: MENTS OF THE STARFISH. 257 



on barnacle- .ni'l mollu-k-. Surely, "the displacements of the 

 internal or^an- which must occur" when the dorsal -ide is down- 

 ward, do not interfere in the lea-t with the in^c-ti. >n and di^c-tion 

 of f. M id. Such "di-placcments" can, therefore, hardly be con- 

 -id- rion-b. 'or the riijitin^ nio\ ement- taking 



pl.f 



\Ye arc forced Delude, from the oli~cr\ ation^ dr-i-ril'cd, 



thai, a- Loeb h ted, the starfish cca-c-. it- effort- to ri-ht 



If the inoincni all the tube feet can be brought into contact 



with a solid surface. ( -ra\ it\ - plays no part in the riijitin;.; nio\ c- 



Illcllt-. 



I 'he ilc,i ha- I'ccn ad\aiiced by Loeb 1 that the mechani-m of 

 the i i^hiin^ movements i- the result of coordinating and inhil>it- 

 i in pn l-c-, \\ hit h arc I ran -in itt eel to the \ ariou- arm- b\ the 

 \ cut ral nei \ c n 



^i\ ili-timt method- ot the rii-htin.n reaction ha\c been de- 



- ribed b\ Jciinin^-. but he has made no anal\ -i- of them on the 



is of inhibiting and ci ninlinat inv; impul-e-. M\ ob-ciA at ion- 



A i' !i Loeb's assumption and give a rather simper < \plana- 



t ion i il t he I >ch.i\ i< M ( it t he -lai li-h. 





\- a rule, \\heii a -tarti-h is placed upon it- dor-al -idc, the 

 arm \\ho-e tube feet lir-t touch bottom deti-rmine- the coiir-e 

 of the ri.uhtiniL;. This arm be^in- at it- di-tal end to t\\i-t the 



np.irativi- I'hy-i ; ,:i." ("li.ipti i 





