CONTENTS OF No. 199.-New Series. 



MEMOIRS : 



PAGE 



On the Development of Nebalia. By Makgaket Robinson, Zoologi- 

 cal Research Laboratory, University College, London. (With 

 Plates 16—21) . . . . . .383 



On the Early Stages in the Development of Flustrella hispida 

 (Fabricius), and on the Existence of a "Yolk Nucleus" in the Egg 

 of this Form. By R. M. Pace (nee Clark), Late Scholar of Girton 

 College, Cambridge. (With Plates 22—25) . . .435 



Researches on the Origin and Development of the Epiblaslic Trabe- 

 culae and the Pial Sheath of the Optic Nerve of the Frog, with 

 illustrations of Variations met with in other Vertebrates, and some 

 Observations on the Lymphatics of the Optic Nerve. By J. T. 

 Gradon, M.A,, St. John's College, Oxford. (W^ith Plates 26 and 

 27) . . . . . . .479 



Piroplasma muris, Fant., from the Blood of the White Rat, with 

 Remarks on the Genus Piroplasma. By H. B. Fantham, 

 B.Sc.Lond., A.R.C.S., Derby Research Scholar, University College, 

 London ; and Demonstrator in Biology, St. Mary's Hospital Medical 

 School. (With Plate 28) . . . . . 493 



