Restorative Regeneration of Linckia. 



355 



regenerative phenomena none the less interesting. I have seen no 

 example of the regeneration of several new arms (or a new disc 

 and arms) from the distal end of a mutilated arm, as observed by 

 the Sarasins in Linckia multifera (Ergeb. Naturforsch. auf Ceylon, 

 1884-85, I, Wiesbaden, 1888). In all cases of regeneration from 

 the distal end of an arm noted among the Apia reef starfishes, 

 simply a continuation, in straight line, of the tapering tip oc- 

 curred. Among the figures will be noted the illustrations of three 

 specimens in which the regenerating arm has had its distal end 



Fig. 6. Linckia diplax, {a) a specimen regener- 

 ating parts of two arms: {b) the aspect of a normal 

 madreporite (compare with the regenerated madre- 

 porite shown in figures i and 2). 



torn off (or thrown off) as well as having been Itself broken off 

 from its basal extremity, and thus freed from the rest of the body 

 to which it originally belonged. In all of these cases of mere seg- 

 ments of a single arm regeneration is proceeding at both mutiliated 

 ends. 



In Figures i and 2 a new mouth and both^ madreporites are in 

 the regenerated part. In Figure 3 a new mouth has been already 

 regenerated, but no madreporite as yet. In Figure 4 is shown an 



^Linckia diplax is characterized by the possession of two madreporites. 



