DICHOTOMY. 



117 



two embryos, except that one of the two germs, though 

 not aborted, merely left traces of its former existence." 



In a foot-note Duges makes a further observation : 

 " Even in the ovary we perceive that these eggs pre- 

 sent two distinct cicatricula, in some isolated, in others 



FIG. 64. A, Transverse section of a double embryo 

 of Lnmbricus trapezoides. 



B, Transverse section of an embryo of L. trapc- 

 zoides. One embryo is suppressed and appears 

 merely as an excrescence. (After Kleinenberg.) 



contiguous." Duges illustrates the phenomena he 

 describes by some crude drawings, but there can be no 

 ambiguity about the facts to which he drew attention. 



The embryology of the worms concerning which 

 Duges made the above curious observations has been 



