Abstract
The materials for the present investigation consist of embryos of the three common species of Apteryx , viz., A. australis, A. oweni and A. mantelli . Most of them, including all the earlier stages, were collected for me by Mr. R. Henry, of Lake Te Anau; a nearly ripe embryo of A. mantelli was obtained from Mr. A. Reischek: and I am indebted to Mme. Müller for a half-ripe specimen of A. oweni , and to Sir Walter Buffer for two, somewhat older, of A. mantelli . I desire to record my sincere thanks to the Council of the Royal Society for the grant which has enabled me to defray the expenses of the investigation.
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