( 2 ) 



JOURNAL 



OF THE 



EOYAL MICEOSCOPICAL SOCIETY. 



Ser. 2.— Vol. IV. Part 1. 



(FEBRTTARY, 1884.) 



CONTENTS. 



Teansactions of the Society — 



PAGE 



I. — The Constituents of Sewage in the Mud of the Thames. By 



Lionel S.Beale, F.K.S., Treas. E.M.S. (Plates I.-IV.) .. .. 1 



II. — On the Mode of Yision with Objectives of Wide Apeetuee. 



By Prof. E. Abbe, Hon. F.E.M.S. (Figs. 1-7) .. .. .. .. 20 



Summaet op Oueebnt Eeseaeches eblating to Zoology and 

 Botany (peinoipally Inveetebeata and Ceyptogamia), Mioeo- 

 scoPY, &c., including Oeiginal Communications peom Fellows 



AND OTHEES .. 27 



Zoology. 



Influence of Gravity on Cell-Division 27 



Influence of Physico-Cliemical Agencies upon the Development of the 



Tadpoles of Bana esculenta 29 



Colours of Feathers 29 



Rudimentary Sight apart from eyes 31 



Nerve-centres of Invertebrata 32 



Tracks of Terrestrial and Fresh-water Animals 34 



Growth of Carapace of Crustacea and of Shell of MoRusca 34 



Commensalism between a Fish and a Medusa 35 



Symbiosis of Algas and Animals 35 



Skin of Cephalopoda 36 



Development of Gills of Cephalopods .... , 37 



Further Researches on Nudibranclis 38 



Functions of the Renal Sac of Heteropods 38 



Interstitial Connective Substance of Mollusca 39 



Visual Organs in Solen ., .. 39 



Respiratory Centre of Insects - 40 



Chordotonal Sense-organs and the Hearing of Insects 41 



Number of Segments in the Head of Winged Insects .. .. 43 



Protective Device employed by a Glaucopid Caterpillar , . 44 



Formation of Honeycomb 44 



Mouth-Organs of Rhynchota .. .... .. 45 



Development of Genital Organs of Insects 45 



Genital Ducts of Insects . . 46 



Thoracic Musculature of Insects , 47 



Farly Developmental Stages of Viviparous Aphides 47 



Chlorophyll in Aphides .. 48 



Testis of Limulus 49 



Polymorphism of Sarcoptidae .. .. 49 



Spermatogenesis of Podophthalmate Crustacea .. .. 50 



American Isopoda .. , 50 



New Host for Cirolana concharum Harger 51 



Copepoda Entoparasitic on Compound Ascidians 51 



Anatomy and Physiology of Saeculina 51 



Classification of the Phyllodoceidas .. 53 



Anatomy of Polynoina.. .. 54 



Spadella Marioni 54 



Neic Forms of Thalasaema 55 



