CONTENTS OF No. CXXXIII.— New Series. 



MEMOIRS: 



PAGE 



The Anatomy of Pentastonium teretiusculum (Baird). By 

 W. Baldwin Spencer, M.A., Professor of Biology in the Uni- 

 versity of Melbourne. (With Plates I— IX) ... 1 



On the Minute Structure of the Gills of Palsemone tes varians. 

 By Edgar J. Allen, B.Sc., University College, London. (With 

 Plate X) 75 



