82 PLANARIA FELINA. 



nal tail separated by spontaneous division. 

 It might have been expected, that the 

 other, which seemed capable of fulfilling all 

 the organic functions, would have effected 

 the purposes of nature ; nevertheless a re- 

 production of the first extremity ensued. 



A monstrosity of a very extraordinary 

 kind occurred just about the close of my 

 whole observations on planariae. On the 

 thirtieth of March, I took between thirty 

 and forty of the species, two of which ex- 

 hibited some peculiarity at the very termi- 

 nation of the tail ; there seemed to be an 

 unnatural redundance of organization. A 

 few days after, on inspecting one of them ? 

 I was surprised to see this deformity con- 

 sist of a minute animal, in progress to com- 

 plete regeneration, attached to the extre- 

 mity by a slender ligament. Its head was 

 pale, not perfectly shaped, but the margi- 

 nal specks were perceptible ; and its posi- 

 tion, when at freedom, was almost at right 

 angles to the larger planaria. How had 

 the creature been formed? Probably an 



