Embryology. 1037 
‘Script, gives the credit of having been the first to suggest the 
_ origin of the segmental ducts and the establishment of their con- 
tection with the cloaca, as given in an abstract of Professor 
‘Haddon’s paper, given in a recent number of this journal. 
_ The Vestiges of a Zonary Decidua in the Mouse.—An ac- 
‘Count of some researches on this subject was given in the Au- 
gust number of this journal by the editor of this department. 
tions of some of the material in my possession, cut in such 
I find that the at first greatly thickened portion of the mucous 
‘Membrane in the region of the embryos undergoes some very 
es. At first the mucosa thickens very much 
: fcetus and its membranes, is, as as in my pre- 
note, nothing more or less than the transitory representa- 
Of a zonary or girdle-like decidua, all traces of which are 
before the end of foetal life. 
Mode in which this hypertrophied portion or annular 
of the mucosa is absorbed is highly interesting. In the in- 
n of a zonary placenta. The presence o abortive vnc 
face of the chorion in the vicinity is a further proot © 
© T Anatomischer Anzeiger, ii., No. 21, p. 646, iati - 
