13 
but the egg was lying in the tubar, not in the uterine part of the 
oviduct. The ostium and the cloacal opening were normal, and so 
was the ovary. On the right side was found a very distinct Wolff- 
ian duct (without coils), beginning in front from a broadened and 
flattened part — containing remnants of mesonephric tubules -— 
and ending behind in a cloacal papilla; also on the left side of 
the cloaca, just inside the margin of the opening of the oviduct, 
a similar papilla was observed "), 
Taking these facts together I thought to have before me a 
pseudohermaphroditic hen. To make this safe and for comparison 
I took to examine some well-grown chickens, males and females. 
Much to my surprise I found that every hen-chicken examined 
showed Wolffian ducts distinctly recognisable in the whole of their 
extent, but without cloacal papillæ. Further examination of quite 
adult hens gave a similar result; only in very aged specimens no 
traces of Wolffian ducts could be seen. Subsequently I extended 
the examination to other birds, and by and by a number of dif- 
ferent species came under anatomical observation with the result, 
that almost all fullgrown females examined were in possession of 
quite recognisable Wolffian ducts, in some cases to be seen plainly 
in their whole length, in others only partially; in very old speci- 
mens, however, the ducts were not visible, or at any rate not with 
Certainty. Generally the right duct is most easily observed, while 
the greater part of the left may be hidden by the oviduct or by 
the origin of the suspensory ligament of the latter, the only part 
to be detected being the flattened anterior part connected with 
remnants of the mesonephros. Also the right duct may to a great 
extent be concealed owing to adherent air-sacs.?) 
In the following birds I have observed the ducts: domestic 
fowl, pheasant (Phasianus colchicus), pigeon, several wild ducks 
Ånas boscas, A. crecca, Annie clypeata, Dafila acuta, Oedemia 
Bee eee MENEs 
7) The hen (now mounted in the collection of the Zoological laboratory of 
the University) was demonstrated, and an account on arrhenoidia in birds 
Siven in the meeting of the Natur. Hist. Society Jan. 18th 1901. 
”) In most cases I have not Es able to settle if any genital papillæ were 
Present in the cloaca; most of my material was handed over to me from 
2 private collector, and at rn in bodies from which the cloaca had 
en cut away in taking off the skin for mounting. 
