354 



Vernon L. Kellogg. 



the U. S. Bureau of Fisheries' Samoan Explorations party, my 

 attention was particularly attracted by the many examples of star- 

 fishes with regenerating arms, and I gave some special care to pick- 

 ing up such specimens. From this material the figures here pre- 

 sented have been drawn and in themselves tell how effectively this 

 capacity for restorative regeneration obtains in this species. 



Morgan calls attention in his "Regeneration" (1901, p. 102 

 and elsewhere) to the assertions of some authors that starfishes 



Fig. 3. Linckia dip lax, 

 regenerating from a sin- 

 gle arm. 



Fig. 4. ((?) Linckia dip- 

 lax, a single arm broken 

 at both ends regenerat- 

 ing. (^) Aspect of proxi- 

 mal end of arm. 



Fig. 5, Linckia. pacifica, 

 regenerating from a sin- 

 gle arm, broken off ob- 

 liquel}' from the original 

 disc; note four new arms 

 and disc, the outer arms 

 larger than the two inner 

 ones. 



can regenerate a new disc and other arms from an arm torn olf 

 without any part of the disc attached, and to the denials by other 

 authors that such radical restoration can take place. In the case of 

 Linckia diplax there seems to be no doubt of the capacity of an 

 arm torn off at some distance from the disc to regenerate a com- 

 plete new animal from its proximal surface. The possibility that 

 these arm pieces were thrown off by autotomy instead of being 

 torn off by enemies may be noted, but such a condition makes the 



