CONTENTS OF No. 167 -New Series. 



MEMOIRS : 



PAGE 



The Constitution and Development of the Society of Termites : Ob- 

 servations on their Habits; with Appendices on the Parasitic 

 Protozoa of Termitidse, and on the Embiidse (concluded from Vol. 

 39, p. 315). By Professor B. Grassi in collaboration with Dr. A. 

 Sanjiias ........ 1 



On the Structure of Hydractinia echiuata. By Margaret C. 



CoLLCDTT, Zoological Laboratory, University College, London. 



(With Plate 1) 77 



On the Histology of the Ovary and of the Ovarian Ova in certain 



Marine Fishes. By J. T. Cunningham, M.A.Oxon. (With 



Plates 2—4) 101 



On Ptychodera flava, EschschoUz. By Arthur Willey, D.Sc, 

 (With Plate 5) . . . . . . .165 



On the Nephridia of the Polychseta. Part I. — On Hesione, Tyrrhena, 

 and Nephthys. By Edwin S. Goodrich, B.A., Assistant to the 

 Linacre Professor, Oxford. (With Plates 6—9) . . .185 



The Pre-ocular and Post-ocular Tentacles and Osphradia of Nautilus. 

 By Arthur "Willey, D.Sc. (With Plate 10) . . . 197 



On Heteroplana, a New Genus of Planariaus. By Arthur Willey, 

 D.Sc 203 



