CONTENTS 



PAGE 



INTRODUCTORY ......... 5 



INVERTEBRATA 17 



PROTOZOA 17 



RHIZOPODA ........ 24 



FLAGELLATA *. 36 



CILIATA (Infusorians) 47 



SPOROZOA (Gregarines) ...... 54 



PORIFERA (Sponges) ........ 67 



COELENTERATA ......... 74 



CTENOPHORA ........ 75 



HYDROZOA ........ 76 



ACTINOZOA or ANTHOZOA ...... 85 



PLATYHELMINTHES (Flat Worms). ..... 89 



TURBELLARIA (Planarians) ..... 90 



TREMATODA (Flukes) 91 



CESTODA (Tapeworms) . . . . . .96 



NEMATODA (Round Worms) ...... 102 



ANNELIDA (Segmented Worms) . . . . . .113 



ARCHIANNELIDA . . . ... . .114 



CHAETOPODA (Bristle Worms) . . . . .115 



HIRUDINEA or DISCOPHORA (Leeches) . . . . 123 



ARTHROPODA 126 



CRUSTACEA 127 



PROTOTRACHEATA (Peripatus) 137 



INSECTA 137 



Do. BLOOD-SUCKING FLIES .... 142 



Do. FLEAS, BUGS, LICE 146 



ARACHNID A, XEPHOSURA . . . . . .156 



Do. SCORPIONIDA 156 



Do. PENTASTOMIDA . . . . .157 

 Do. ACARINA (Mites and Ticks) . . .157 



ECHINODERMATA. . . . . . . . .163 



ASTEROIDEA (Starfishes) . . . . . . J(i4 



ECHINOIDEA (Sea-urchins) . . . . . .164 



HOLOTHUROIDEA (Sea-cucumbers) . . . .164 



MOLLUSCA . . . . . . . . . .1C)-") 



GASTEROPODA (Snails, etc.) 



PELECYPODA or LAMELLIBRANCHIATA (Bivalves) . I<>7 



SIPHONOPODA or CEPHALOPODA (Cuttlefishes) . . 1HS 



VERTEBRATA or CHORD ATA . . . . . . .177 



HEMICHORDA or ENTEROPNEUSTA (Balanoglossus, etc.) 177 



1'iKM'HORDA or TUNICATA (Tunicates or Ascidians) . I SI 



CEPHALOCHORDA (Amphioxus) I So 



CRANIATA, Structure and Development . . . 104 



Do. CYCLOSTOMATA (Kouiul Mouths) . . . 215 



Do. PISCES (Fishes) 217 



Do. AMPHIBIA (Amphibians) . . . . L':'.l 



Do. REPTILIA (Reptiles) 2:$<) 



Do. AVES (Birds) 240 



Do. MAMMALIA (Mammals) . . . .250 



