241 
1914-15.] The Keflexes of Autotomy in Decapods. 
of the second segment. A definite time relation of about three seconds 
exists between the two events (fig. 11). 
Fig. 11. — A, tail contractions ; B, contraction of extensor of second segment. Time 
in seconds. This trace is only meant to indicate the time relations of reflexes. 
The curves on B occurring simultaneously to those on A are due to inertia.. 
Electrical stimulation of the cut end of the limb produces the same 
result as cutting, but tail-flapping does not always follow. 
Fig. 12. — Compared with fig. 10, this contraction is much greater in extent and duration. 
It occurred when the nerve segment was isolated. 
When the segment of the nervous system innervating the limb is 
isolated from those above and below, the extent of contraction of the 
extensor of the second segment increases (fig. 12), and the time of con- 
traction is prolonged. 
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