CONTENTS OF No. 219.-New Series. 



MEMOIRS : 



PAGE 



Notes on the Free-living Nematodes. I. The Hermaphrodite Species. 

 By F. A. Potts, M.A., Fellow of Trinity Hall, Cambridge, and 

 Demonstrator of Comparative Anatomy in the University. (With 

 11 Text-figures.) . . . . . .433 



Observations on Trypanoplasma Congeri. Part 1. I'he Division of 

 the Active Form. By C. H. Martin, B.A., Demonstrator of 

 Zoology, University of Glasgow. (With Plate 21 and 1 Text- 

 figure) ....... 48.J 



The Development of Aplysia punctata. By A. M. Caeb 

 Saunders and Margaret Poole. (With Plate 22 and 20 Text- 

 figures) ....... 497 



The Relation between Light and Pigment-formation in Crenilabrus 

 and Hippolyte. By F. W. Gamble, F.R.S., Mason Professor of 

 Zoology, University of Birmingham. (With Plate 23) . . .541 



Is the Trophoblast of Hypoblastic Origin as Assheton will have it? 

 By A. A. W. Hubrecht. (With 7 Text-figures) . . .58.5 



The Origin and Formation of Fibrous Tissue produced as a Reaction 

 to Injury in Pecten Maxim us, as a Type of the Lamelli- 

 branchiata. By G. H. Drew, B..A.., Beit Memorial Research Fellow, 

 and W. De Morgan, F.Z.S. (With Plate 24) . . . .595 



