Vlll CONTENTS. 



ova producing germs or embryos, impregnation, production of new beings with aiid 

 without metamorphosis, transformation into Acinetre, 345 ; nature of Ciliated Pro- 

 tozoa, their existence as independent organisms, cell-theory applied to tlunn, 368: 

 conditions of life, 370 ; succession of species, 371 ; duration of life, influence of 

 external agents, heat and cold, 373 ; necessity of air, chemical agents, electricity and 

 galvanism, 374; affinities with other animals, geographical distribution, 375 ; classi- 

 fication, 376. Subgroups of Ciliated Protozoa : Icldliyclina, 380; Noctihicida, 382; 

 Dysteria, 387. 



EoTATORiA or RoTiFERA : general characters, 392 ; appendages, 397 ; the muscular system, 

 406 ; movements, 409 ; the digestiA^e system, 410 ; reception of food, its deglutition, 

 420 ; the secreting system, 422 ; the vascular and respiratory systems, 426 ; the 

 nervous system, organs of sense, psychical endowments, 434; reproductive organs, 

 441 ; formation of ova, 442 ; development of embryo, 445 ; the embryo-metamor- 

 phosis, 447 ; winter ova, 450 ; male Rotatoria, 453 ; duration and conditions of life, 

 habitats and distribution, 463 ; affinities and classification, 468 ; Elirenberg's classifi- 

 cation, 478 ; Dujardin and Ley dig's classifications, 480. 



Tardigrada : their structure, habitats, and affinities, 482. 



PAET II. — A Systematic History of Infusoria, with Descriptions op the 

 Families, Gtenera, and Species. 



Group PiiYTOzoA. Families : Monadina, 485 ; Hydromorina, 503 ; Cryptomonadina, 505 ; 

 Volvocina, 514 ; Vibrionia, 529 ; Astasia^a or Euglenaea, 538 ; Dinobryina, 547. 



Group Protozoa — Subgroup Ehizojyoda. 547: Amoebsca, 548; Arcellina, 551; Actino- 

 pliryina, 558 ; Acinetina, 564. — Subgroup Ciliata, 568. Astoma : Opalinsea, 569 ; 

 Cyclidina, 571 ; Peridinisea, 574. Stomatoda : Vorticellina, 579 ; Ophrydina, Vaginifera, 

 598; Enchelia, 605; Colepina, 616: Trachelina, 616; Ophryoc«rcina, 630; Aspidis- 

 cina, 631 ; Kolpodea or Colpodea, 631 ; Oxylrichina, 639; Euplotina, 645. 



Group Rotatoria. Families : Ichthydina, 660 ; CEcistina, 663 ; Megalotrochasa, 664 ; 

 Floscularia, 665 ; Hydatineea, 677 ; Albertina, 693 ; Euchlanidota, 693 ; Philodineea, 

 700 ; Brachionsea, 706. 



Group Tardigrada, 713. 



Group Bacillaria : Desmidiacete, 715 ; Diatomacese, 756. 



Index to the Illustrations of the Diatomaceae, 941. 



Description of the Plates, 949. 



Index to the Families and Genera, 965. 



