In other decapod crustacea also it has been shown that the power of regeneration of the appendages is well developed. It has been long known that the crayfish and the lobster can regenerate lost parts. The first pair of legs, or chelæ, in these forms has a breaking-joint, at which the leg can be thrown off, yet in the crayfish I have seen that if the leg is cut off inside of the breaking-joint it will regenerate. The four pairs of walking legs do not possess a breaking-joint, but may be thrown off in some cases at a corresponding level. They regenerate from this level, as well as nearer the body and farther beyond this region. Przibram has recently shown that, in a number of crustacea, regeneration of the appendages takes place, even when the entire leg is extirpated as completely as possible. Newport has shown that the myriapods can regenerate their legs, and it is known that several forms have the power of breaking off their legs in a definite region at the base if the legs are injured, and I have observed in _Cermatia forceps_ that this takes place even when the animal is thrown into a killing fluid. Newport (’44) has also shown that when the legs of a caterpillar are cut off new ones regenerate during the pupa stage. It has been long known[42] that the legs of mantis can regenerate, and Bordage, who has recently examined the question more fully, has shown that a breaking-joint is present at the base of the leg. The tarsus of the cockroach also regenerates, producing only four, instead of the five, characteristic segments.[43] A number of writers have recorded the regeneration of the legs of spiders.[44] Schultz, who has recently examined more thoroughly the regeneration of the legs in some spiders, finds that the leg is renewed if cut off at any level. He removed the leg most often at the metatarsus, but also at the tibia, and generally between two joints. In some cases the leg was cut off at the coxa, at which level it is generally found to be lost under natural conditions. Wagner observed in tarantula that when the leg is removed at any other place than at the coxa, the animal brings the wounded leg to its jaws, and bites it off down to the coxa. In the _Epeiridæ_, that Schultz chiefly made use of, this never happened. He observed, however, even in these forms, that when the leg is cut off at the coxa it regenerates better than [Illustration: FIG. 38.--_A-F._ After King. _A._ Starfish with four arms regenerating at different levels. _B._ Three arms regenerating from disk. _C._ Arm split in two producing two arms. _D._ Arm cut off obliquely, regenerating at right angles to cut-surface. _E._ Starfish split between two arms, producing two new arms from split. _F._ An arm, with a small piece of disk attached, regenerating three new arms. _G._ After P. and F. Sarasin, Starfish (_Linckia multiformis_) with four new arms springing from end of one arm. Interpreted as a new starfish, but probably only multiple arms (see _C_, above).]