xii GENERAL INDEX. 



CHAPTER III. 



INFUSORIA. 



Page Sec. 



INFUSORIA Restriction of the term _ . , . 31 . 63 



Boundary between the Animal and Vegetable Kingdoms .... 32 . n. 



Locomotive apparatus of the Infusoria 34 . 66 



Cilia 34 . 67 



Ciliary action 34 . 68 



Mechanism of the stem of Vorticella 34 . 69 



Trichocysts 35 . 70 



Arrangement of the digestive apparatus, according to Ehrenberg . 86 . 73 



Objections to Ehrenberg's views 36 . 74 



Organization of the Infusoria, according to M. Dujardin .... 38 . 79 



Observations of M. Meyen upon this subject 39 . 80 



Acineta, observations of Dr. Lachmann 40 . 83 



Internal structures observable in the Infusoria 41 . 84 



" Bound corpuscles" 41 . 84 



" Gastric juice" 41 . 85 



Contractile space 41 . 87 



Nucleus . . 44 . 90 



Horny integument 44 , 91 



Reproduction of Infusoria 44 . 92 



by external gemmation 44 . 93 



spontaneous fissure 44 . 94 



as exhibited in Convattaria 45 . 97 



Wonderful productiveness of the fissiparous mode of generation . 46 . 99 



Reproduction by encystment 47 . 101 



Stein's views relative to the metamorphoses of Vorticella .... 47 . 101 



Encapsulation of Kerona pustulata 48 . 103 



Ploesconia Charon . 49 . 104 



Propagation by embryos or internal germs 50 . 105 



Metamorphoses of Trichoda Lynceus . 53 . 110 



CHAPTER IV. 



ANTHOZOA. 



ANTHOZOA External resemblance to plants 54. Ill 



General description 54 . 112 



Fungice and Meandrln 54 . 113 



Structure of Fungia agariciformis 54. 114 



Nature of its gelatinous investment . . . . 55 . 115 



Reproduction of Fungice 55 . 116 



Calcareous polypary deposited in the areolse of the living tissue . . 55 . 118 



CORTICAL COMPOUND ANTHOZOA 56 . 119 



Then* various forms 56 . 120 



ALCYONID^E 56 . 121 



Organization of Cydonium Miilkri 57 . 122 



Inquiry concerning the compound nature of the Alcyonidaj ... 57 . 123 

 Milne-Edwards' s researches relative to the structure of Alcyonidium 



ekgans 58 . 125 



Anatomy of the individual polyps 58 . 126 



Organization of the common polypary 60 . 128 



Gemmiparous mode of reproduction 62 . 133 



Reproduction by gemmules . .-..,.' 63 . 135 



Alcyonium stellatum, . -, * 64 . 141 



Vascular canals of the polypary 64 . 141 



Mode of reproduction . . . .. .. .-. --v-'-'j" -.'.- .... 65 . 142 



MADHBPORID/E ?--. - : . . . . 67 . 144 



Formation of coral reefs .':.,. . 67 . 145 



