CONTENTS OF No. CXVI.— New Series. 



MEMOIRS: 



PAGE 



Contributions to the Knowledge of Amphioxus lanceolatus, 

 Yarrell. By E. Ray Lankester, M.A., LL.D., F.R.S., Professor 

 in University College, London. (With Plates XXXIV, XXXV, 



XXXVI. XXXVI ^, and XXXVI ^) . . . .365 



Studies in the Embryology of the Echinoderms. By H. Bcry, B.A., 

 P.L.S., Fellow of Trinity College, Cambridge. (With Plates 



XXXVII, XXXVIII, and XXXIX) . . . .409 



On the Ancestral Development of the Respiratory Organs in the 

 Decapodous Crustacea. By Florence Buchanan. A Paper read 

 to the Biological Society of University College, London. (With 

 Plate XL) .... ... 451 



