350 



GENERAL ZOOLOGY 



replaced. If a limb bud is removed from a mammalian embryo, 

 regeneration does not occur. Regeneration in the adults of 

 vertebrates is confined almost entirely to wound healing. This 



Fig. 198. — Regeneration in Euplanaria. A, regeneration of the anterior and 

 posterior ends following transverse section. B, regeneration in piece taken 

 from the middle. C, regeneration of new head on piece from head region. D, 

 regeneration of a larger head piece. (After Morgan.) 



Fig. 199. — Regeneration in the starfish, Asterias. In A a single arm is regenerat- 

 ing, in B four arms. Both are young animals. 



also has a protective significance since wounds caused by injuries 

 of whatever sort, unless promptly closed, may lead to serious 

 results not only because of the primarily traumatic effect but 



