The Behavior of Loxophylliini 



415 



possibility suggested itself that the new cilia which were devel- 

 oped arose through the influence of the old ciliated margin or of 

 material which were developed arose through the influence ot 

 the old ciliated margin or of material which might be derived 

 from it. To test this possibility a specimen was cut as is shown 

 in Fig. 5 so as to leave no part of the cialiated oral margin remain- 

 ing. The general course of regeneration is indicated by the Figs. 

 2-6, It will be seen that the aboral side, as before, extends at 

 first more than the oral, but after the oral margin becomes dif- 

 ferentiated in its characteristic fashion it pushes around more than 

 the aboral and produces the usual curvature at the anterior end 

 of the body. The cilia made their appearance in scattered groups 

 about fourteen hours after the cut was made. 



Fig. 6 Regeneration after removal of the dorsal half. 



When Loxophyllum is cut in two longitudinally the process of 

 *^ regeneration is comparatively slow. The usual form of the body 

 may be approximately reached in a comparatively short time, but 

 the differentiation of the structures characteristic of either margin 

 requires several hours. Fig. 6 represents a specimen from which 

 the aboral half was removed by a longitudinal cut. The posterior 

 end of the first became bent aborally and was brought forward so 

 that the two parts of the cut margin met and fused together. The 

 body as a whole shortened and widened; the injuries that were 

 incidentally made near the anterior end of the body were repaired, 

 and while the cut margin so far as could be ascertained seemed 

 to close by the approximation of the upper and lower edges it 

 was over twelve hours before the groups of trichocysts character- 

 istic of the aboral margin made their appearance. 



