CONTENTS. 



Tbaksaowons of the Sooiett — 



PAGE 



XI. — Eeseaeches on the Stbuotueb of the Cell-walls of Diatoms. 



By Dr. J. H. L. Flogel (Plates VIII. and IX.) .. .... 505 



XII. — On a New Micbotomb. By C. Hilton. Golding-Bird (Figs. 



83 and 84) .. .. .. .. .. .. .. 623 



Xni. — On some Appeabanobs in the Blood of Vbetebbatbd Animals 



WITH EbFEBBNOB to THE OOCUBBBNOE OF BaOTEBIA THEREIN. 



By G. F. Dowdeswell, M.A., F.R.M.S., &c. 525 



XIV. — On Pbotospongia pedicbllata, a new compound Infdsobium. 



By Frederick Oxley, F.E.M.S. (Figs. 85 and 86) .. .. .. 530 



XV. — On a New Fobm of Polaeizing Peism. By C. D. Alirens 



(Figs. 87 and 88) 533 



sommabir of cueeent essbaeohes eelating to zoology and 

 Botany (pbinoipally Invbetebeata and Cetptogamia), Miobo- 

 8C0PY, &c., including Obiqinal Communications from Fellows 



and 0THEB3 535 



Zoology. 



Polur Globules and other Elefnents eliminated from the Ovum 535 



Embryonic Germinal Layers and the Tissues . . . , . . , . 538 



Origin of the Mesoblast of Cartilaginous Fishes .. 538 



Intra-cellidar Digestion in the Germinal Membrane of Vertebrates .. , , 539 



Larval Theory of the Origin of Cellular Tissue 540 



Development of Frotovertebrse 541 



Experiments in Arrested Development . . 541 



Morphology of the Directive Corpuscles .. .. .. 541 



Morphology of the Pineal Gland 542 



Segmentation of the Veiiebrate Body 543 



Embryology of Alytes obstetricans .. - 544 



Devehpment of the Nervous System of Forella 546 



Incubation of Eggs in Confined Air — Influence of Ventilation on 



Embryonic Development . . 54G 



Effect of High Pressure on the Vitality of Micro-organisms 547 



Micro-organisms of the Deep Sea 547 



Origin and Formation of Glairine or Bard'gine 547 



Organisms in Hailstones 548 



Suckers of Sepiola .. .. .. .. ,. 548 



Histology of Digestive System of Helix 549 



Aplysiie of the Chdf of Naples 550 



Morphology of the Acephalous Molluscq ., 550 



Anatomy of Bhopalsea 552 



Luciola italica 552 



Development of Mcanthus niveus and its parasitic Teleas 553 



Originof Be&f Cells 554 



Closed Poison-glands of Caterpillars 555 



Gills of Insect Larvx 555 



Dangers from the Excrement of Flies , 556 



Nerve-terminations on Antenna of Chilogitaiha 556 



Ovum of Geophili .. .. 557 



Poison' Apparatus and Poison of Scorpions .. 558 



Structure and Function of the Liver of Spiders 658 



Anatomy of Acarina .. .. 559 



Sexual Colour-Variation in Crustacea 560 



Observatiooii on Tanais oerstedi . . 561 



New and Bare French Crustacea .. .. 562 



Nervous System of Euniceidse .. ,. 564 



Cerebrum of Eunice harasm, and its relations to the Hypodermis . . . . 564 



VarieH^$ of Branchiobdella variana . . , . . . , 565 



