CONTENTS. 



PAGE 



*Me. F. M. BALrouE, and Me. A. Sedgwick. — On the 

 Existence of a Head-kidnej in the Embryo Chick 

 and on some Points in the Development of the 

 Miillerian Duct. Plates I and II . . 1 



*Me. E. M. Balfoue. — On the Early Development of the 

 Lacertilia, together with some Observations on 

 the Nature and Eolations of the Primitive Streak. 

 Plate III . . . . . .21 



**Me. F. M. Balfotje. — On Certain Points in the Ana- 

 tomy of Peripatus Capensis . . .31 



*Me. W. B. Scott and Me. Henet E. Osboen — On some 

 Points in the Early Development of the Common 

 Kewt ...... 34 



*Me. Adam Sedgwick — Development of the Kidney in its 



Eelation to the "Wolffian Body in the Chick . 62 



*Me. E. M. Baltotje — Notes on the Development of the 



Araneina . . . . • ,83 



**Mr. Adam Sedgwick. — On the Development of the 

 Structure known as the ' Glomerulus of the 

 Head-kidney ' in the Chick , . . 107 



N.B. — The papers marked with one asterisk are reprinted from 

 the ' Quarterly Journal of Microscopical Science,' those with two 

 asterisks, are reprinted from the ' Proceedings of the Cambridge 

 Philosophical Society.' 



