LIST OF ILLUSTRATIONS 



FACING PAGE 



Amoeba with ingested diatoms 4 



Globigerina Ooze ......... 4 



Foraminifera (N. depressula) . 5 



Radiolaria . .. \ * . ... . . . . . . 5 



Noctiluca miliaris . - . . . ' .'*;' . . . 16 



SpJiavozoum punctatum, SL Colonial Radiolarian . . . 16 

 Ceratium . . . . . . . . .16 



Trypanosoma gambiense. Cause of sleeping sickness . . 17 



Trypanosoma bvuccii. Cause of nagana in cattle and horses 17 

 Leucosalinia blanca . . . . . . . .32 



A branching sponge . . . . . - .' ;v - 3 2 



Venus's flower-basket sponge . . '.""; ... 33 



Glass-rope sponge . - . ' * . * . - . . . . 33 



Fresh-water hydra with tentacles partially contracted . . 40 

 Polyparies of hydrozoa "' .' . . . . . .40 



Portion of living hydroid colony - - . . 41 



Portion of living hydroid colony, showing the vase-like gonotheca 41 



Hydra Fusca, with young bud ...... 48 



A hydroid medusa . . . . * . '" ... 48 



Beroe ovatus . . - \, ' .:. . . .... 48 



Sea anemones . . . * . , ^ . . . 49 



Polyps of Pennatula phosphoria, the sea-pen .... 52 



Polyps of Corallium rubrum, the red coral . ... 52 



A mushroom coral . . . . . -53 



Caryophyllia smithii, the so-called " Devonshire " coral ; dead and 



expanded specimens 53 



A branching coral ........ 58 



A massive stony coral . . . . . 58 



