CONTENTS OF No. 263, N.S., September, 1922. 

 MEMOIRS : page 



Further observations on Chromosomes and Sex-determination in 

 Abraxas gross ulariata. By the late Professor L. Doncaster, 

 F.R.S., University of Liverpool ....... .397 



The Infra-cerebral Organs of Peripatus. By WnxiAM J. Dakin, 

 D.Sc, F.Z.S., F.L.S., Derby Professor of Zoology, University of 

 Liverpool. (With 4 Text-figures) 409 



A Critical Study of the Facts of Artificial Fertilization and Normal 

 Fertilization. By J. Gray, M.A., Fellovs^ of King's College, Cam- 

 bridge. (With 1 Text-figure) 419 



Calma glaucoides : A study in adaptation. By T. J. Evans, M.A. 

 (Oxon.), Lecturer in the Medical School. Guy's Hospital, London 

 University. (With Plate 11 and 3 Text-figures) . . . .439 



The Segmentation of the Head in Squalus acanthi as. By 

 G. Rylands de Beer, B.A., B.Sc, Demonstrator in the Department 

 of Zoology and Comparative Anatomy, University Museum, Oxford. 

 (With 13 Text-figures) 4;-)? 



Some Notes on the Gametogenesis of Omithorhynchus paradoxxis. 

 By J. Bronte Gatenby, M.A., D.Phil. (Oxon.), D.Sc. (Lond.). 

 Professor of Zoology and Comparative Anatomy, Dublin University. 

 (With Plates 12, 13, 14, and 1 Text-figure) . . . . \ 415 



Note on the Comparative Effects on Tissues of Isotonic Saline and 

 Distilled Water when used as Solvents for Mercuric Chloride and 

 Formol in Histological Fixation. By H. M. Carleton, Lecturer 

 in Histology, University of Oxford . . . . . . .501 



On the Structure of the Alimentary Canal and its Ferments in the Bee 

 (Apis mellifera, L.). By E. N. Pa\xovsky, M.D., D.Sc, 

 Professor at the Military Academy of Medicine, Petrograd, and 

 E. J. Zarin, M.Phar., Professor at the University of Latvia, Riga. 

 (With 3 Curves and Plates 15, 16, 17) 509 



CONTENTS OF No. 264, N.S., December, 1922. 

 MEMOIRS : 



The Nature of certain Ovum-like Bodies found in the Seminiferous 

 Tubules. By F. A. E. Crew and Honor B. Fell. From the 

 Animal Breeding Research Department, University of Edinbui-gh. 

 (With Plates 18-23) 557 



Glossobalanus marginatus, a new species of Enteropneusta 

 from the North Sea. By Alexander Meek. (With 14 Text- 

 figures) ........... 579 



Studies on Insect Spermatogenesis. V. On the Formation of the Sperm 

 in Lepidoptera. By Robert H. Bowen. From the Department 

 of Zoology, Columbia University. (With Plates 24-26) . . . 595 



On the Biolog)'^ and Structure of the Larvae of Hydro philus 

 caraboides, L. By E. N. Pavlovsky, M.D., D.Sc, Professor 

 of Zoology at the Military Academy of Medicine, Petrograd. (With 

 Plate 27 and 16 Text-figures) 627 



A further Account of the Spermatogenesis of Lice. By H. Graham 

 Cannon. (With 1 Text-figure) 657 



Cannibalism in Amoeba vesper tilio (Penard). By Geoftrey 

 Lapage, M.Sc, M.B., Lecturer in Zoology. The Victoria University 

 of Manchester. (With Plates 28, 29, and 3 Text-figures) . *. 669 



