9 8 



REGENERA TION 



are used for procuring food, and as organs of offence and defence ; 

 the second and third pairs are used for walking. The following two 

 pairs, that correspond to the last two pairs of walking legs of crabs 

 and crayfishes, are small, and are used by the animal in bracing it- 

 self against the shell. The first three pairs of legs have an arrange- 



FlG. 37. Appendages of Hermit-crab (Eupagurus longicarpus} . A. Third walking leg. B. Next 

 to last thoracic leg. /?'. Last thoracic leg. C, C l , C 2 . Three abdominal appendages of male. 

 D. Telson and sixth segment with last pair of abdominal appendages. E. Regeneration of 

 new leg from cut-end outside of " breaking-joint." F. Leg regenerating from cut made inside 

 of " breaking-joint." G. Leg regenerating from cut made very near the body. 



ment at the base, the " breaking-joint," by means of which the leg is 

 thrown off, if injured. The last two pairs of thoracic legs cannot be 

 thrown off. The first three pairs of legs are often lost under natural 

 conditions. In an examination of 188 individuals I found that 21 (or 

 1 1 per cent) had lost one or more legs. If one of the first three legs 

 is injured, except in the outer segment, it is thrown off at the break- 



