II. Observation on the anatomy and development of apteryx

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Abstract
The chief materials for the present investigation consist of a number of embryos of the three common species of Apteryx which have come into my possession during the last three or four years. For some time I only succeeded in obtaining two or three specimens of advanced stages, and it was only when I was fortunate enough to secure the services of Mr. Richard Henry, of Lake Te Anau, as collector, that my material became copious enough to be worth working up. Even now my observations are in many respects very imperfect owing to the lack of a sufficient number of specimens, many of the most important stages being represented only by a single embryo. Since communicating a preliminary note (28) on the subject to the Royal Society I have found it necessary to extend my investigations, so as to include certain points in the structure of the adult, especially the pterylosis and the characters of the wing, the sternum, shoulder-girdle, and skeleton of the fore-limb, the muscles of the wing, and the brain.

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