3 
taken place in 7 at the end of the experiment, and two individuals 
had died. Had the crabs been kept for a longer time there can be 
little doubt that more of the crabs would have regenerated. 
From experiments made at different times during the summer I 
have taken the following examples. The first five figures, Figs. 1—5, 
show some of the new legs that regenerated (Aug. 24—Sept. 26). In 
Fig. 1, a small leg, is developing from the free end of the basal segment. 
The old leg had been cut off very near to the body leaving only a 
small part of the basal segment. In Fig. 2 a similar case is re- 
presented. (The basal segment or as much of it as is present is shaded 
in all the figures.) In Figs. 4 and 5 the new leg is quite large and 
the typical segments are present including the missing part of 
the basal segment, and also the breaking-joint between 
the two following segments. 
In another experiment (July 23—Sept. 10) the second leg was cut 
off inside of the breaking-joint. In this case also a new leg developed 
as shown in Fig. 6. 
Fig. 4. Fig. 5. Bigs Gy Pisi i. 
In another experiment (Aug. 12—Sept. 11) the third leg was cut 
off and as shown in Fig. 7 it had, in this case, completely regenerated, 
being only a little smaller than the second uninjured leg of the other 
side. Here also the outer part of the basal segment had regenerated 
and also the breaking-joint. 
These examples will suffice to show that there can be no doubt 
that the first three legs can regenerate when cut off inside of the 
breaking-joint, and that in such cases the entire limb, including the 
breaking-joint itself, is regenerated. 
The Legs cut off distal to the Breaking-Joint. 
In order to carry out this experiment it was necessary to devise 
some means to prevent the leg from being thrown off, after the oper- 
ee 
