CONTENTS. 



CONTENTS OF No. 160, N.S., JANUARY, 1898. 



MEMOIRS : PAGE 



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

 Growth of the Triradiate and Quadriradiate Spicules in the 

 Family Clathrinidae. By E. A. Minchin, M.A., Fellow of 

 Merton College, Oxford. (With Plate 38—42) . . 469 



The Early Development of Amphioxus. By E. W. MacBeide, 

 M.A., Fellow of St. John's College, Cambridge; Professor of 

 Zoology in the McGill University, Montreal. (With Plates 

 43—45) ........ 589 



On Drepanidotseniahemignathi, a New Species of Tapeworm. 

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

 Cambridge, and University Lecturer in the Advanced Morpho- 

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



Spengelia ; a New Genus of Enteropneusta. By Abthur Willey, 

 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.R.S., Professor of 

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



Note on the Development of the Atrial Chamber in Amphioxus. 

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



Title, Index, and Contents. 



