CONTENTS. 



CONTENTS or No. 157, N.S., APRIL, 1897. 



MEMOIRS : PAGE 



The Constitution and Development of the Society of Termites : 

 Observations on their Habits ; with Appendices on the Para- 

 sitic Protozoa of Termitidse, and on the Embiidse (concluded 

 from Vol. 39, p. 315). By Professor B. Gkassi in collaboration 

 with Dr. A. Sandias ...... 1 



On the Structure of Hydractinia echinata. By Margaret 

 C. Collcutt, 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, Eschscholtz. By Arthur Willet, 

 D.Sc. (With Plate 5) 165 



On the Nepliridia of the Polychseta. Part I.— On Hesione, 

 Tyrrhena, and Nephthys. By Edwin S. Goodrich, B.A., As- 

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



The Pre-ocular and Post-ocular Tentacles and Osphradia of Nau- 

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



On Heteroplana, a New Genus of Planarians. By Arthur 

 Willey, D.Sc, . . . . . . .203 



CONTENTS OE No. 158, N.S., AUGUST, 1897. 



MEMOIRS : 



The Adhesive Tentacles of Nautilus, with some Notes on its 

 Pericardium and Spermatophores. By Arthur Willey, D.Sc. 

 (With Plate 11) 207 



