CONTENTS. 



Teansaotions of the Society — 



J>AGE 



XVL Kbbeakohes on the Struotuee op the Cell-walls of 



Diatoms (continued). By Dr. J. H. L. Flogel (Plates X. 



and XL and Fig. 119) .. .. 665 



XVII On Deawing Peisms. By J. Anthony, M.D. Cantab., 



r.E.C.P., F.K.M.S. (Figs. 120-22) 696 



SUMMAET OF CUEEENT EeSEAECUES EELATING TO ZoOLOGY AN% 



Botany (peinoipally Inveetebbata and Ceyptogamia), Micro- 

 scopy, &c., including Oeiginal Communications feom Fellows 



AND othees 704 



Zoology. 



Embryology of the Sheep .'. .. 704 



Development of the Generative Organs 705 



Spermatngenesis 706 



Factors of Sexuality 708 



Rudimentary Placenta in Birds .. .. 709 



Permanence of larval conditions in Amphibia .. .. 710 



Embryo Fishes 711 



Development of Viviparous Minnows 712 



Formation of and Beactions of Nuclei .. .. 713 



Indirect Nuclear Division 713 



Nucleus of the Auditory Epithelium of Batrachiam 715 



Epidermis of the Chick .. 715 



Scales, Feathers, and Sairs 716 



Locomotion of Anim(ds over smooth Vertical Surfaces .. .. 716 



Zoology of the Voyage of the ' Alert' .. .. 718 



Origin of Fresh-water Faun^ 719 



Pelagic Fauna of Fresh-water Lakes 720 



Lowest and Smallest Forms of Life as revealed hy the modern Microscope . . 721 



Intelligence in the Lowest Animals 725 



New type of Mollusc 727 



Taking-in of Water in relation to the Vascular System of Molluscs . . . . 728 



Eyes and other Sense-organs in the Shells of Chitonidm . . . . . . . . 728 



Benal Organs of Embryos of Helix , 729 



Nervous System of Parmophorus australis 730 



Organization of Haliotis 730 



Absorption of the Shell in Auriculidse 730 



Development of the Digestive Tube of Limacina .. . . 731 



Simple and Compound Asddians 731 



Digestion in Salpa . . . • 732 



Fresh-water Bryozoa . . • • 732 



Supposed neio species of Cristatella .. .. 733 



New Type of Elastic Tissue, observed in the Larva of Eristalia 733 



Submaxillary of the Jaw of Mandibulate Insects 733 



Structure and Function of Legs of Insects 734 



Organs of Attachment on the Tarsal Joints of Insects 736 



Locomotion of Insects on Smooth Surfaces 737 



Organs of Flight in the Hymenoptera 738 



Poison of Hymenoptera and its Secreting Organs 739 



Development of Cerocoma Schreberi and Stenoria apicalis .. 739 



Dipterous Larvse 739 



Larva; of North American Lepidoptera .. 740 



Drinking Habit of a Moth 741 



Michael's British Oribatidse 741 



Stomach of Podophthalmate Crustacea 742 



Significance of the Larval Skin in Decapods .. .. .. 744 



New or Bare Crustacea 744 



New Type of Hirudinea .. .. .. 744 



Structure of the Branchise in Serpulacem 745 



Structure and Development of Fresh-water Dendrocoela 746 



Classification of the Botif era 748 



Constitution of Echinoderms .. .. •■ 750 



Pdurtalesia .. 751 



