iv CONTENTS. 



PAGE 



On the Early Stages in the Development of Elustrellahispida 

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

 Egg of this Form. By R. M. Pace (uee Clakk), Late Scholar 

 of Girton College, Cambiidge. (With Plates 22—25) . 435 



Researches on the Origin and Development of the Epiblastic 

 Trabeculse 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. Gkadon, M.A., St. John's College, Oxford. (With 

 Plates 26 and 27) . • • • • 479 



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

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

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

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

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



CONTENTS OF No. 200, N.S., NOVEMBER, 1906. 



MEMOIRS : 



On the Structure of the Nephridia of Dinophilus. By Ckess- 

 WELL Sheaber, Trinity College, Cambridge. (With Plates 29 

 and 30) . . . . . . 517 



Contributions to our Knowledge of the Anatomy of Notoryctes 

 typhlops, Stirling; Part III. — The Eye. By Georgina 

 Sweet, D.Sc, Melbourne University. (With Plate 31) . 547 



Structure and Origin of Canker of the Apple Tree. By James 

 E. Blomfield, M.A., M.D.Oxou. (With Plate 32) . . 573 



Review of Dr. Richard Goldschmidt's Monograph of Am phi- 

 oxides. By A. WiLLEY, Hon. M.A.Cantab., D.Sc.Lond., 

 F.R.S. (With seven text-figures) . . .581 



The Modification of the Sexual Characters of the Hermit Crab 

 caused by the Parasite Peltogaster (castration parasitaire of 

 Giard). By E. A. Potts, B.A., Trinity Hall, Cambridge. 

 (With Plates 33 and 34) ... . 509 



On thcMedusaof Microhydra ryderi, and on the Known Forms 

 of Medusae inliabiting Fresh Water. By Edward Totts, of 

 Philadelphia, U.S.A. (With Plates 35 and 36) . . 623 



On the Freshwater Medusa liberated by Microhydra ryderi, 

 Potts, and a comparison with Limnocodium. By Edward 

 T. Browne, B.A., Zoological Research Laboratory, University 

 College, Loudon. (Witii Plate 37) . ' • • 635 



Title, Index, and Contents. 



