340 STUDIES IN GENERAL PHYSIOLOGY 
presence of asupernumerary segment leads one to suspect that 
the regenerated piece might perhaps have developed into a 
leg in the course of time; that, in other words, we might 
have had to do with a heteromorphosis, namely, the forma- 
tion of a leg in the place of the body segment which had 
been cut off. Hoek,’ however, states that the abdomen of 
Ammothez not infrequently shows traces of a segmentation. 
P 
FIG. 96 FIG. 97 
I had the animal shown in Fig. 97 cut into serial sections, 
which I examined microscopically. The intestine had grown 
into the anterior portion of the regenerated piece. The 
tissues were, however, but little differentiated. 
3. The regenerated pieces ab of Figs. 96 and 97 did not 
make their appearance gradually and then grow steadily 
larger, but they suddenly appeared with the size and differ- 
entiation shown in the picture, while on the previous day no 
regeneration had been visible. As each operated animal 
was kept in a separate dish upon which its history had been 
written, and as each animal was examined daily, we must 
conclude that the regeneration and growth of the new pieces 
occur slowly under the skin, and that at the next molting 
the regenerated piece becomes suddenly visible. I have 
1H9%EK, Archive de zodlogie expérimentelle, Vol. IX (1881). 
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