IV CONTENTS. 



CONTENTS OF No. 167, N.S., AUGUST, 1899. 



MEMOIRS : PAGE 



The Structure of Xenia Hicksoni, nov. sp., with some Observa- 

 tions on Hater oxen ia Elizabeth se, Kolliker. By J. H. 

 AsHWOETH, D.Sc. (Loud.), Demonstrator in Zoology, Owens 

 College, Manchester. (With Plates 23—27) . . .245 



Notes on the Batrachians of the Paraguayan Chaco, with Observa- 

 tions upon their Breeding Habits and Development, especially 

 with regard to Phyllomedusa hypochondrialis. Cope. Also 

 a Description of a New Genus. By J. S. Budgett, Trinity 

 College, Cambridge. (With Plates 28—32) . . .305 



The Development of Echinoids. Parti. — The Larvae of Echinus 

 miliaris and Echinus esculentus. By E. W. MacBkide, 

 M.A., Professor of Zoology in McGill University, Montreal. 

 (With Plate 33) .335 



Hydroids from Wood's HoU, Mass.: Hypolytus peregrinus, a 

 New Unattached Marine Hydroid ; Corynitis Agassizii and 

 its Medusa. By L. Mukbach. (With Plate 34) . . 341 



Note. — Arhynchus hemignathi. By Arthur E. Shipley . 361 



CONTENTS OF No. 168, N.S., SEPTEMBER, 1899. 

 MEMOIRS : 



The Structure and Metamorphosis of the Larva of Spongilla 

 lacustris. By Richard Evans, B.A., Jesus College, Oxford. 

 (With Plates 35—41) . . . . . .363 



On the Communication between the Ccelom and the Vascular 

 System in the Leech, Hirudo medicinalis. By Edwin S. 

 Goodrich, B.A., Aldrichian Demonstrator of Comparative 

 Anatomy, Oxford. (With Plates 42—44) . . .477 



Balanoglossus otagoensis, u. sp. By W. Blaxland Benham, 

 D.Sc, M.A., Professor of Biology in the University of Otago, 

 New Zealand. (¥/ith Plate 45) . . . . . 497 



The Movements of Copepoda. By E. W. MacBride, Professor 

 of Zoology, McGill University, Montreal . . . 505 



TiTLK, Index, and Contents. 



