12 
(1889, p. 137, and p. 186, No. 4), and regarded as being possibly 
a thelyid cock (1. c. p. 144). It resembled a hen to that degree, 
that it had been bought as a hen for lecture purposes. It posses- 
sed two sexual glands, which, as to shape, were intermediate be- 
tween ovary and testis, but as to inner structure were decidedly 
testes; an oviduct (left) was present, but the seminal ducts (out- 
side the epididymis) were not developed. The sexual glands were 
sterile. Thus the latter case appears to be very different from 
those described by me: the above two pigeons seem really to re- 
present the first and only cases of male pseudohermaphroditic 
birds hitherto recorded. 
On the other hand, if we consider the female sex, we shall 
find that cases of preservation of the Wolffian ducts are men- 
tioned in the literature both as a normal phenomenon in somé 
birds, and as an abnormality in pseudohermaphroditic specimens. 
The fact that adult. female birds normally may possess moré 
or less recognisable Wolffian ducts seems not yet commonly 
known, and has only quite recently been stated by Chappellier. 
As I myself for many years have been acquainted with the nor 
mal persistence of these ducts in a good many adult birds, I now 
take the opportunity here to confirm and extend the observations 
of Chappellier and to recount how I was led to my own obser- 
vations. , 
In November 1900 Mr. Gustav Larsen, a well known physician 
of Copenhagen, sent to me an arrhenoid hen, 57/2 years old. The 
arrhenoidia appeared more pronounced in manners and behaviour 
than in external structures. From earliest youth it had been crowing 
and otherwise behaving like a cock, f. inst. trying to collect other 
hens, to "'tread” hens etc., but besides it had frequently laid e885 
which seemingly were normal, but never yielded any chickens; 
" the comb and the ''beard” did not differ markedly from those of 
a normal hen, and the plumage very little, only some of the neck- 
feathers resembling, as to shape and gloss, those of the cock; the 
left leg wore a strong spur, while the right had only an enlarged 
scale in the corresponding place. 
The postmortem-examination showed the oviduct to be extremely 
enlarged, abnormally distended by its contents: a series of lumps 
of white-of-egg among which a complete egg, provided with a shell; 
