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 Dugés makes a further observation : 
“Even in the ovary we perceive that these eggs pre- 
sent two distinct cicatricula, in some isolated, in others 
Fic, 64.—A, Transverse section of a double embryo 
of Lumbricus trapezoides. 
B, Transverse section of an embryo of LZ. trape- 
zoides. One embryo is suppressed and appears 
merely asan excrescence. (After Kleinenberg.) 
contiguous.” Dugés 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 
Dugés made the above curious observations has been 
