• CONTENTS OF No. 160.-New Series. 



MEMOIRS 



PAGE 



Materials for a Monograph of the Ascons. I. On the Origin and 

 Growth of the Triradiate and Quadriradiate Spicules in the Family 

 Clathrinidse. By E. A. Minchin, M.A., Fellow of Merton 

 College, Oxford. (With Plates 38—42) . . . .469 



The Early Development of Amphioxus. By E. W. MacBkide, M.A., 

 Fellow of St. John's College, Cambridge ; Professor of Zoology in 

 the McGill University, Montreal. (With Plates 43—45) . . 589 



On Drepanidotaenia hemignathi, a New Species of Tapeworm. 

 By Arthur E. Shipley, Fellow and Tutor of Christ's College, 

 Cambridge, and University Lecturer in the Advanced Morphology 

 of the Invertebrata. (With Plate 46) ... . 613 



Spengelia; a New Genus of Enteropneusta. By Arthur Willet, 

 D.Sc, Balfour Student of the University of Cambridge. (With 

 Plate 47) 623 



On a Prorhynchid Turbellarian from Deep Wells in New Zealand. 

 By William A. Haswell, M.A., D.Sc, F.B.S., Professor of Bio- 

 logy, Sydney University. (With Plate 48) . . . 631 



Note on the Development of the A.trial Cliamber in Amphioxus. By 

 E. Ray Lankester, M.A., LL.D., F.R.S 647 



Index . . . * . . . .651 



Table of Contents. 



