348 BULLETIN OF THE MUSEUM. 



done almost entirely upon sections of specimens hardened and treated with reagents, 

 and every ftmbryologist is well aware how untrustworthy results reached in this way 

 often are, unless they are carefully compared with those reached by a thorough study 

 of the living embryo, and also verified in every possible way. As I made no sections, 

 but confined my attention to the living animal, I am unable to offer any suggestion as 

 to the way in which what I believe to be the errors of interpretation in this paper are 

 to be explained, and am therefore compelled to confine myself to this very short and 

 unsatisfactory notice. 



