( 2 ) 



JOUBNAL 



OF THE 



EOYAL MICEOSCOPICAL SOCIETY. 



Ser. 2.— Vol. II. Part 5. 



(OCTOBER, 1882.) 



CONTENTS. 



Transactions of the Soodsty— page 



XTV.— Plant-Crystals. By Dr. Aser Poli (Plate VI.) 597 



Summary of Current Eesearohes relating to Zoology and 

 Botany (principally Inyertebbata and Cryptogamia), Micro- 

 scopy, &c, including Original Communications from Fellows 



and others .. .. .. ■ .. .. .. .. .. .. .. .. 601 



Zoology. 



Symbiosis of Dissimilar Organisms .. .< 601 



Electric Organs of Gymnotus .. . 602 



Intracellular Digestion .. .. .. .. 602 



Nervous System oj ' MoUusca .. .. .. .. .. • • 603 



North-American Cephalopoda .. .. •• 604 



Marginella and the PseudomargineUida 604 



Vascular System of Naiades and Mytilidm .. .. .. .. 605 



Sexuality of the Oyster .. .. 606 



Respiratory Movements of Insects 606 



Location of Taste in Insects .. .. .. .. .. .. .. 607 



Parthenogenesis in the Bee.. .. .. 608 



Eye of Chloe diptera .. .. 609 



Marine Caddis-fly .. .- .. 610 



Respiratory Organs of Arachnids (Figs. 109-112) .. .. .. .. .. .. 610 



Habits of Scorpions .. .. •• •• 612 



Nest-forms of the Furrow Spider .. .. •• •• 613 



Parthenogenesis in the House Spider 614 



Segmentation in the Mites .. ... .. .. • •• 614 



Perception of Colour by Crustacea .... .. .. •• •• 615 



Mediterranean Crustacea .. .. .. •• •• •• 615 



North American Crustacea .. .. .. 617 



New Copepoda .. 617 



Development of Annelids ' 618 



Development of the Central Nervous System of Annelids .. 619 



Coral-reef Annelid ..' 621 



Muscular Tissue of the Leech 621 



Observations on the Dicyemidse .. .. •• 621 



Orthonectida 624 



New Rotifer {Cupelopagis bucinedax) 625 



Anatomy of Echinoids 626 



Anatomy of Spatangus purpureus .. .. •. •• 627 



Development of Asterina gibbosa .. 628 



Brisinga • •• ♦• 631 



Anatomy of Holothurians 632 



Tissues of Siphonophora •■• .. 633 



Development of Tubularia cristata 634 



American A calephse •• 634 



Sense of SmeU in Actinise .. .. 635 



