JOUKNAL 



or THE 



EOYAL MICEOSCOPICAL SOCIETY. 



VOL. II. No. 4. 



CONTENTS. 



Tbansactions of the Society — paou 

 XIX. On the Development and Eetrogression op the Fat- 

 cell. By George Hoggan, M.B,, and Frances Eliza- 

 beth Hoggan, M.D 353 



XX. On some ^Supplications op Osmic Acid to Microscopic 



Purposes. By T. Jeffery Parker, B.Sc, F.R.M.S. .. 381 



XXI. Is NOT THE ROTIFEROTTS GeNUS PeDALION OP HuDSON 

 SYNONYMOUS WITH HeXARTHRA OP LUDWIG ScHMARDA ? 



By Julien Deby, F.R.M.S 384 



XXII. Note on M. Deby's Paper. By C. T. Hudson, LL.D., 



V.P.E.M.S 386 



XXIII. An Illuminating Traverse-Lens. By Robert B. 



Tolles, of Boston, Mass., U.S 388 



XXIV. On the Occurrence op Recent Hbteropora. By 



Arthur Wm. Waters, F.G.S. (Plate XV.) .. ..390 



XXV. Note on Homogeneous Immersion Object-glasses. By 



F. H. Wenham, F.R.M.S 394 



Notes and Memoranda .. .. .. .. .. .. 395 



Zoology. 



Primitive Stripe in the Chick 395 



Evolution of the Male and Female Genital Glands of Mammalia ,. . . 397 



Natural Science Prizes of the Brussels Academy 397 



Cells and Nuclei 397 



Invertebrates of Kerguelen's Land 398 



Blood-cells of the Acephala 398 



Later Stages in the Development of Fresh-water Mussels 399 



Locomotion of the Terrestrial Gasteropoda 399 



Auditory Organs of the Heteropoda 401 



Peculiarity in Littorina 401 



Structure and Physiology of the Octopus 402 



Neomerda and the other Amphineura 404 



Anatomy of Chiton 404 



Phenomena which precede the Segmentation of the Ovum in Helix aspersa .. 405 



Liver and Digestion of the Cephalopodous Mollusca .. . . 405 



New Tunicata 407 



Gall-making Aphides 407 



Buzzing of Insects 408 



Larval Cases of Phryganeidx 408 



Development of the Silkworm 409 



Venomous Caterpillars 411 



Abortion of the Hairs on the Legs of certain Caddis-Jlies 412 



Comparative Embryology of the Insecta 413 



Tracheal System of Glomeris " 414 



Structure of the Hydrachnida 415 



Acarina found parasitic in the Cellular Tissues and Air-sacs of Birds .. 415 



