18 



THE HISTOGENESIS AND GROWTH OF THE OTIC CAPSULE AND ITS 



particularly .suitable for the purpose at hand. They are arranged in the apparent- 

 order of development. The measurements given are those under which they are 

 listed in the catalogue of the collection, and they all signify crown-rump measure- 

 ment. Where sections were photographed this is indicated and the slide number, 

 followed by the row and number of section, is given. 



Table of Specimens. 



In studying the development of the cartilaginous capsule and the histogenesis 

 of the periotic reticulum it was found necessary to prepare enlarged photographs 

 of the special regions studied. By having these all made on the same scale of 



