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 leeture purposes. It posses- 
sed two sexual giands, 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 duets (out- 
side the epididymis) were not developed. The sexual giands were 
sterile. Thus the latter ease appears to be very different from 
those deseribed by me; the above two pigeons seem really to re¬ 
present the First and only eases of male pseudohermaphroditie 
birds hitherto reeorded. 
On the other hånd, if we eonsider the female sex, we shall 
Find that cases of preservation of theWolffian duets are men- 
tioned in the literature both as a normal phenomenon in some 
birds, and as an abnormality in pseudohermaphroditie specimens. 
The faet that adult female birds normally may possess more 
or less recognisable Wolffian duets seems not yet commonly 
known, and has only quite recently been stated byChappellier. 
As I myself for many years have been acquainted with the nor¬ 
mal persistence of these duets 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, 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 eggs 
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 piumage 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; 
