Wound Reparation—Actinian Tentacles 2277, 
contracted, tapers smoothly to a sharp tip whose diameter is very 
nearly the same as that of the distal pore, whereas the correspon- 
ing proximal cut end is broad and blunt, its walls are abruptly 
inturned, and its comparatively large opening is irregularly out- 
lined. ‘The general form of the fragment, therefore, is that of an 
irregular cone, and the irregularities are much greater toward 
the base of the cone. In all of these respects the most distal 
fragment shows rather less marked polarity than the others. 
The conditions just described persist for many hours or for a 
day or two without noticeable alteration except for the continued 
diminution of the distal pore which, one day after the cutting, is 
usually very minute or not evident at all. 
Three tentacles were excised and allowed to lie undisturbed for 
two days. [hey were then transected about midway of their 
length. ‘The behavior of proximal and distal ends of the frag- 
ments was substantially the same as when transection followed im- 
mediately upon the excision of the tentacle. 
Experiments similar to those just described were made also upon 
tentacles of Aiptasia. ‘The results, so far as polarity is concerned, 
were much less striking than in Condylactis. ‘The comparatively 
small diameter of the tentacles of Aiptasia and their persistent and 
excessive contraction after cutting made them much less favorable 
objects for the expression of any polar tendencies which they may 
possess. In most cases the corresponding proximal and distal 
cut ends exhibited no differences which were marked enough to 
be considered significant. But in a few instances there did 
appear unmistakable differences which were similar in nature to 
those which have been noted in Condylactis. Fig. 16 represents 
a tentacle of Aiptasia cut into two pieces. ‘The distal end of the 
proximal fragment (a) is slightly tapering at its tip, while the 
proximal end of the distal piece (4) is broad and blunt. It should 
be remembered that the normal tentacles show only a slight de- 
crease in diameter from base to tip. Therefore the smaller taper- 
ing distal tip of the proximal fragment and the larger blunt prox- 
imal end of the distal fragment represent regions of the original 
tentacle which originally had practically the same diameter. In 
some cases, too, it was noted that at a distal cut end there was a 
