_ INDEX 
Ambulacral system: starfish, 146; sea 
urchin, 153 ; sea cucumber, 157. 
Amoeba: general form, 194; repro- 
duction, 195; conjugation, 196. 
Amphipod, 48, 50. 
Annelida: Nereis, 61; earthworm, 67. 
Anodonta, 89. 
Anthozoa, 178. 
Arachnida, 24. 
Arbacia, 149. 
Armadillidium, 46. 
Arthropoda, 1. 
Ascidiacea, 135. 
Asterias forbsii, 141. 
Asterias vulgaris, 141. 
Asteroidea, 141. 
Beetle: external parts, 5; mouth- 
parts, 13. 
Bell animalcule, 188. 
Bougainvillea, 163. 
Brachyuran decapod, 42. 
Bryozoa, 85. 
Bugula: the zocecium, 85; polypide, 
85; internal organs, 86; avicularia, 
87; ocecia, 87. 
Calcarea, 181. 
Campanularia, 169. 
Campanularian hydromedusan : alter- 
nation of generations, 169; hydroid 
stage, 169; medusoid stage, 172. 
Caprella, 50. 
Carchesium, 188. 
Caterpillar: external parts, 20; inter- 
nal parts, 20. 
Centiped, 22. 
225 
Cephalopoda, 124. 
Cestoda, 80. 
Chaetopoda: Nereis, 61; earthworm, 
67. 
Chilopod, 22. 
Ciliate infusorian: Paramecium, 184; 
Vorticella, 188. 
Circulatory system: grasshopper, 18; 
crayfish or lobster, 38; Nereis, 64; 
earthworm, 70; Bugula, 87; mussel, 
94; clam, 108; snail, 116; squid, 
129; Molgula, 187; starfish, 148; 
sea urchin, 154. 
Cladoceran phyllopod, 56. 
Clam, see Hard-shell clam. 
Cnidaria: Hydra, 159; tubularian 
hydromedusan, 163; campanularian 
hydromedusan, 169. 
Coleopterous insect, 5. 
Copepod : external anatomy, 538 
ternal anatomy, 54. 
Crab: external parts, 42; gills, 48; 
internal parts, 44; zoéa of, 51; 
megalopa of, 51. 
Crayfish or lobster: external parts, 28; 
appendages, 32; gills, 35; internal 
organs, 86; circulatory system, 38; 
reproductive system, 39; digestive 
system, 39; excretory system, 40; 
nervous system, 41; mysis stage of 
lobster, 51. 
Crustacea: crayfish or lobster, 28; 
erab, 42; sow-bug, 46; typical am- 
phipod, 48; Caprella, 50; larval 
decapods, 51; copepod, 53; Daph- 
nia, 56; nauplius larva, 59. 
Cyclops, 53. 
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