OCR Text |
Show 1902.] ANATOMY OF THE CONDOR. 241 shown in the drawings to which I have called attention. Here, however, the resemblance ends. For in the male bird I can find no trace visible to the naked eye of the muscular sheath which covers this part of the bronchus in the hen bird. I have carefully looked for these muscles both in the fresh windpipe and after it had been preserved in alcohol. There is no doubt in my mind that the difference indicated does really exist. Moreover, the rather abundant slips of muscle, which, in the hen bird, tie down the end of the bronchus to the membranous surface of the Text-fig. 30. Lower end of windpipe of male Sarcorhamphus gryphus, back view. M.T, membrana tympaniformis. lung, are only just recognizable in the cock bird. I found but one tiny slip (T in text-fig. 29) representing this very striking-feature of the windpipe of the female. This required careful looking for ; there is nothing to strike the eye forcibly. It appeai-s, therefore, that in Sarcorhamphus gryphus certainly, and in Sarcorhamphus cequatorialis probably, there is a marked difference between the sexes in the conformation of the syrinx; and that, in the second place, the more complicated organ is that of the female, and not of the male sex. These birds have no |