XUTivJiPT)!^ j^r 



CONTENTS. 



Preface Page iii 



List of works quoted and abbreviations used herein ix 



PAET I. — A General History op Infusoria, etc. 



Bacillaria : Desmidiece, their figure, page 1 ; colom*, consistence, envelopes, openings in 

 lorica, 4 ; movements and external cilia, 5 ; contents of fronds, 6 ; circulation of con- 

 tents, 7; reproduction, 11; habitats, distribution, appearance in masses and vital 

 endowments, vegetable natm-e and affinities, mode of collection, 20. — Tediadrece, their 

 figure, composition, and contents of cells, 24 ; number and disposition of the cells in 

 the fronds, 25 ; development and growth, 29 ; systematic position, 30. — Biatomacecs, 

 their general and external characters, 31 ; figiu'e, 32 ; the silicious shell or lorica, its 

 divisions and structm'al composition, markings, striae, canalicidi, puncta, &c., 37; 

 contents of frustides, supposed digestive sacs, reproductive vesicles, &c., 47; move- 

 ments, their character and causes, cilia, circulation of contents, respiration, 50; 

 nutritive functions, supposed stomachs, 56 ; multiplication, reproduction, and develop- 

 ment, 58 ; conjugation, 61 ; habitats, appearance m masses, abundance, 75 ; geogra- 

 pliical distribution, 79 ; geological importance and fossil accumidations, 82 ; aerolitic 

 Diatomete, 85 ; uses of Diatomaceous deposits, 86 ; of the nature of Diatome^e, whether 

 animals or plants, various hypotheses, 87; determination of species and genera, 

 varieties, classification of Kiitzing, Smith, and others, 96 ; on the mode of obtaining, 

 preparing, and preserving specimens, 102. 



Phytozoa: the beings included imder this name, their general character, division into 

 groups or tribes, their figure, coverings, 111; cell-contents, 113; movements, 117; 

 process of nutrition, 119; multiplication and reproduction, fission, macrogo'nidia^ 

 microgonidia, 120; encysting process, condition of rest, 123; phases of being and' 

 alternation of generation, 124; on their nature, animal and vegetable characters, 128; 

 habitats, occurrence in masses, colour caused by their accimiulation, 129. — Families : 

 Monadina, ISO ; Cryptomo7iadma, 14Q ; Volvocin a, 144:; Vibrionia, 184: ; Astastcea ov 

 Euglencea, 188 ; nature of Astasiaea, 196. 



Protozoa, 199. — Bhizopoda, 201; movements of contained particles, 210; nucleus, 211- 

 reproduction, 213; of the testaceous shells of Monothalamia, 218; shells of Polytha- 

 lamia or Foraminifera, 222; dimensions and conditions of life, 227; habitats and 

 distribution, 229 ; of their cell-nature and characters as individuals or as colonies of 

 animals, 232 ; on their affinities, 234 ; classification, 237. Actinophri/ina, 243 ; 

 movements, 246; prehension and entrance of food, 247; contractile vesicle, 250; 

 nucleus, 252 ; encysting, fission, gemmation, embryos, 253 ; conjugation, 256 ; loca- 

 lities, affinities, 257. Acinetina, 258 ; origin and development, 261. Gregarinida, 

 262. Psorospermia, 265. Ciliata, 266. Subgroup A. Astoma: OpalincBa, their 

 general characters and functions, 267 ; nucleus, self-division, supposed embryos, 269 ; 

 habitats, vital endowments, nature, affinities, classification, 270. Peridinicea' 271 • 

 contents, 274 ; reproduction, 275. Subgroup B. Sfomatoda : dimensions, 277 ; figure,' 

 278 ; consistence, 279 ; integmnent, markings on surface, spines, lorica, 280 ; externai 

 sheaths or cases, 282; ciHa and ciliary action, 285; locomotive and fixed forms 

 varieties of locomotion, transitory power of locomotion among the attached genera,' 

 288; structure of pedicles, 292; compound special organs of locomotion and pre- 

 hension, the peristom and rotary or ciliated disc, the spirally-coiled head of Spiro- 

 chona, 294. — Ciliated Protozoa, internal organization : subtegumentary layer, chloro- 

 phyll, thi'ead-cells, 297 ; muscles, 300 ; organs of digestion, nutrition, and secretion, 

 301; the polygastric hypothesis, 303; dental apparatus or teeth, 311; contractile 

 vesicle, 312; nucleus, nucleolus, 326; ovules, 334; spermatozoids, 337; accessory 

 contents, graniUes, molecules, spherical cells, supposed glands, 338; circulation of 

 contents, 339. The encysting process, .341 ; reproduction, fission, gemmation, internal 



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