LIST OF ILLUSTRATIONS 
© ON ONAWNHNG 
. Fertilisation in Ascaris megalocephala—after Boveri . 
. Modes of Segmentation : : : ‘ ; 
. Life history of a coral, Monoxenia darwinii—from Haeckel . 
. Embryos—(1) of bird; (2) of man—after His. The latter 
—>— 
. Duckmole (Ornithorhynchus). z 
/’henacodus, a primitive extinct Mammal—after Cope 
Extinct moa and modern kiwi—-after Carus Sterne 
. Crocodiles . é 
Salamander, an Amphibian 
. Queensland dipnoan (Ceratodus) 
. Alancelet, Amphioxus—after Haeckel 
. Ascidian or sea-squirt—after Haeckel 
. Cephalopod (paper nautilus, female) . : : : 
. Fresh-water crayfish (Astacus), a Crustacean—atter Huxley . 
« @, Caterpillar; 4, pupa; c, butterfly . . : 
. Spider . . 
. Crinoid or feather-star 
. Earthworm ‘i ‘ ; 
. Bladderworm stage of a Cestode—after Leuckart 3 
. Sea-anemones on back of hermit-crab—after Andres . ‘ 
. Fossil Foraminifera (Nummulites) in limestone—after Zittel . 
. Diagrammatic expression of classification in a genealogical 
tree. B indicates possible position of Balanoglossus. 
D of Dipnoi, S of Sphenodon or Hatteria x % 
. Diagram of Vertebrates 
. Diagram of Invertebrates 7 
. Diagram of cell structure—after Wilson 
. Structure of the cell—after Carnoy 
. Fertilised ovum of Ascarzs—after Boveri 
. Diagram of cell division—after Boveri te 
. ‘Karyokinesis—after Flemming é . . 
. Diagrammatic expression of alternation of generations 
. Diagram of ovum, showing diffuse yolk granules. 
. Forms of spermatozoa (not drawn to scale) . : 
. Diagram of maturation and fertilisation. (From “Evolution 
of Sex”) . F : 
about twenty-seven days old F : 
a) 
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a 
a 
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