GENERAL INDEX. 



CHAPTER I. 



ON CLASSIFICATION. 



Page Sec. 



System of Aristotle 1 . 2 



Linneeus 1,3 



Hunter -. -.' v ; 9 . '4 



Cuvier 3 '..;'.' 5 



Arrangement founded on the condition of the nervous system ... 4 . 10 



CHAPTER II. 



PEOTOZOA. 



RIIIZOPODA 5 . 13 



Structure of Gromia oviformis 5. 13 



Locomotion of Rhizopods 7 . 14 



Their mode of nutrition and reproduction 7.15 



Some of them enclosed in shells 7 . 16 



FORAMINIFERA 7 . 17 



Their organization 8 . 18 



Pseudopodia 8 . 19 



Structure and growth of their shells 8 . 20 



Shell of Orbitolite 9 . 21 



Professor Max Schulze's observations relative to the reproduction of 



the Foraminifera 10 . 23 



Their multitudes and geological importance 11 . 25 



POLYCYSTINA 12 . 27 



ACTINOPHRYS 13 . 28 



Mode of taking and digesting food 14 . 29 



Contractile vesicle . , 15 . 33 



Reproduction by self-division 16 . 35 



NOCTILUC.E 16 . 36 



Their mode of reproduction 17 . 38 



Phosphorescence of the sea 17 . 40 



AMCEB.E 18 . 41 



Structure of Amoeba princeps 19 . 42 



Development from ovules 20 . 43 



SIEGES . 20 . 44 



General structure of Sponges 20 . 45 



Siliceous and calcareous spicula 21 . 47 



Currents visible in the living Sponge 21 . 49 



Proteiform structure of the living substance of Sponges 23 . 52 



Mr. Carter's observations on the nature of Sponge-cells 23 . 53 



Seed-like bodies of the fresh-water Sponge 25 . 58 



Sexual generation of Sponges 26 . 60 



Structure and evolution of spermatozoa 27 . n. 



Reproduction of Sponges from ciliated gemmules 27 . 61 



THALASSICOLLA 29 . 62 



