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that above the antrum the vagina and the ductus vaginalis are 
connected by a solid string of epithelial cells. 
Still another thing should be mentioned. From the distal end of 
the ductus vaginalis runs an epithelial tub5 which, surrounded by 
muscularis, runs in a backward-downward direction. It approaches 
the outer' part of the antrum so that their muscularis partly fuse. 
Then the tube bends backwards and draws near to the muscular 
Wall of the body. Here a solid string of epithelial cells continues 
into the musculature, which it traverses obliquely, reaching finally 
close to the basement membrane. This is, of course, a formation 
that has no function, and might be interpreted as having developed 
during the attempt of the ductus vaginalis to reach the surface of 
the body. It might, of course, be an atavistic feature, and that con- 
sequently this organ represents a formation of rudimentary nature, 
showing us that perhaps the ductus vaginalis has had its own 
opening caudally to the genital pore. In any event, the development 
of the duet is, though slight, a foundation for the conception that 
the ductus vaginalis has been derived from the duet of Lang’s 
glandular vesicle. One might interpret the duet as being derived 
from the condition that the inner continuation of the vagina, which 
is without doubt the duet of Lang’s glandular vesicle, runs direetly 
downwards in an attempt to reach the ventral wall of the body 
and eventually the genital pore. 
In the case of this individual, this development might be 
interpreted as an unsuccessful attempt on the part of the ductus 
vaginalis to reach the genital pore, but for my part I wonder if it 
would not be quite reasonable to interpret it as a rudimentary 
organ, showing that the very existence of a begining of ductus 
vaginalis would indicate that the duet of Lang’s glandular vesicle 
has attempted to become connected with the ventral wall of the 
body. The present case gives support to the theory discussed in a 
previous report (Bock 1925a) that the ductus vaginalis represents 
a secondary arrangement and that the duet of Lang’s glandular 
vesicle is adapted for the purpose of establishing a connection 
outwards. The hindmost part of the canal mentioned would thus 
probably answer to an almost completely reduced Lang’s glandular 
vesicle. 
Male genital Organs: The testes lie just above the ventral 
