536 Charles Zeleny 
It was found that the crabs with both chela removed molted 
sooner than those with only one chela removed. ‘The regener- 
ating buds were in general larger in the specimens with two 
removed chelz than in those with one removed. This was true 
of both molted and non-molted individuals. 
12) The Chele of Alpheus denti pes'® 
In Alpheus dentipes the two chelze have different functions. 
One is larger than the other and different in structure. The 
larger is called the “snapping”’ chela, the smaller the “cutting” 
chela. In nature either one may be on the right side. When 
the cutting chela alone is removed a new cutting chela grows out 
in its place. When the snapping chela is removed the uninjured 
cutting chela is transformed into a new snapping chela while in 
place of the removed snapping chela a new cutting chela develops. ° 
Finally, when both chelz are simultaneously removed a new 
snapping chela grows out in plaec of the old snapping and a new 
cutting in place of the old cutting chela. The gradation in degree 
of injury to the individual as a whole beginning with the lowest 
injury 1s, 
1 Cutting chela alone removed. 
2 Snapping chela alone removed. 
3 Both chele removed. 
In each case a cutting chela is developed, in the first two cases 
from the single cut surface and in the last case from one of the 
two cut surfaces. 
The rate of molting increases with increase in degree of injury. 
The average molting period for the set with the lowest injury 
was 29.6 days, for the next 28.7 days and for the set with the 
greatest injury 22.9 days. 
Notwithstanding the shorter absolute time allowed to the series 
with the greater injuries the lengths of regenerating cutting 
chela'® were greater in these than in the series with the lesser 
#8 Journal of Exp. Zodl., vol. ii, no. 1, p. 85. 
* “Cutting chele” refers to resultant organs. 
