226 
Daphnia: external parts, 56; internal 
anatomy, 57; parthenogenesis of, 58. 
Decapod: macruran, 28; brachyu- 
ran, 42; larve of, 51. 
Dibranchiate cephalopod, 123. 
Digestive system: grasshopper, 15; 
caterpillar, 21; spider, 27; crayfish 
or lobster, 39; copepod, 54; Daphnia, 
57; Nereis, 64 ; earthworm, 70 ; pla- 
narian, 77; Bugula, 86; mussel, 96; 
oyster, 101; clam, 109; snail, 117; 
squid, 130; Molgula, 136; starfish, 
145; sea urchin, 151. 
Diplopoda, 22. 
Dipterous insect, 7. 
Earthworm: external parts, 67; inter- 
nal anatomy, 69; circulatory system, 
70; digestive system, 71; reproduc- 
tive system, 71; excretory organs, 
73; nervous system, 74; a cross 
section, 74. 
Echinodermata: starfish, 141; sea 
urchin, 149; sea cucumber, 155. 
Echinoidea, 149. 
Ectoproct bryozoan, 85. 
Euglena, 192. 
Excretory system: grasshopper, 16; 
crayfish or lobster, 40; copepod, 55; 
Nereis, 65; earthworm, 73; plana- 
rian, 78; tapeworm, 82; mussel, 
95; clam, 109; snail, 116; squid, 
129; Molgula, 138; Paramecium, 
186; Vorticella, 189; Euglena, 193; 
Amoeba, 195. 
Fly, 7. 
Free-swimming ciliate, 184. 
Freshwater mussel: shell, 89; mantle, 
90; visceral mass, 90; mantle cavity, 
91; respiratory system, 93 ; circula- 
tory system, 94; excretory system, 
95; digestive system, 96; reproduc- 
tive system, 97; nervous system, 97. 
INVERTEBRATE ZOOLOGY 
Freshwater polyp, 159. 
Freshwater shrimp, 48. 
Gammarus, 48. 
Gastropod, 112. 
Gonionemus, 175. 
Grantia: general form, 181; repro- 
duction, 183. 
Grasshopper: external parts, 9; mouth- 
parts, 12; digestive system, 15; 
excretory system, 16; reproductive 
system, 16; respiratory system, 17; 
circulatory system, 18; nervous 
system, 18. 
Hard-shell clam: shell, 103; mantle, 
104; visceral mass, 104; mantle 
cavity, 105; respiratory system, 
107; circulatory system, 108 ; excre- 
tory system, 109; digestive system, 
109; reproductive system, 110; 
nervous system, 111. 
Helix pomatia, 112. 
Holothurian, 155. 
Hydra: general form, 159; reproduc- 
tion, 161. 
Hydromedusan, 163, 169. 
Hydrozoa: Hydra, 159; tubularian 
hydromedusan, 163 ; campanularian 
hydromedusan, 169. 
Hymenopterous insect, 1. 
Infusoria: Paramecium, 184; Vorti- 
cella, 188; Euglena, 192. 
Insect larva, 20. 
Insecta: wasp, 1; beetle, 5; grass- 
hopper, 9; caterpillar, 20. 
Isopod, 46. 
Land snail: shell, 112; visceral mass, 
113; mantle, 113; head, 114; mantle 
cavity, 115; respiratory system, 
116; circulatory system, 116; excre- 
tory system, 116; digestive system, 
