BY T. THOMSON FLYNN. 881 



method of entry and exit of the ducts leading to and out of eacli 

 median cul-de-sac, varies on each side, and seems to be arranged 

 on no settled plan. Leading from the uterine necks, posteriorly 

 to each os, is a fairly wide canal, which is, seemingly, quite 

 distinct, in this specimen, from the median vaginal cul-de-sac. 

 This is to be regarded as an anterior portion of the vaginal 

 section of the Miillerian ducts, which has not entered into 

 the formation of the cul-de-sacs proper. Pending further 

 enquiries into the relationship of this canal in the virgin, I have 

 called it, for the time being, the median vaginal " neck." The 

 vaginal necks on either side have a quite different arrangement. 

 On the left side, eighty-three sections behind the point where the 

 OS ends, there appears, a short distance outside the left vaginal 

 necks, a couple of small cleft-like openings which soon coalesce 

 and enlarge, forming an irregular chamber, the left median 

 vaginal cul-de-sac. The shape of the chamber is indefinite, but 

 it is lined by a well marked epithelium, the cells of which contain 

 large rounded nuclei. Further back the arrangement is as seen 

 in Fig. 8. The left median vaginal cul-de-sac is now a long, low 

 chamber, from which, on the outer side, is being separated ofi' a 

 portion to form the lateral vaginal canal, this being recognised 

 by the longitudinal foldings and corrugations in its walls. This 

 latter soon becomes separated from the left median cul-de-sac as 

 a distinct duct. Just anterior to the sections shown in Fie.8, 

 there has appeared, on the inner ventral side, a number of 

 irregular spaces which soon coalesce to form the large, irregular 

 chamber shown in Fig.8(r.m.v.c.). The position in which these 

 spaces first appear, is at the inner lower angle of the chamber 

 (r.m.v.c.) shown in that figure. The point of exit of the right 

 lateral vaginal canal is shown by the foldings appearing at the 

 lower outer angle of this chamber. Soon the right lateral vaginal 

 canal becomes quite separated fiom the corresponding median 

 cul-de-sac of that side. The irregularity of the whole arrange- 

 ment can be seen if it be noted that, in the case of. the l^ft median 

 vaginal cul-de-sac, the so-called median vaginal neck enters it 

 from the i7iner side, while the lateral vaginal canal exits from 



