INDEX 
117; reproductive system, 120; nery- 
ous system, 121. 
Limax maxima, 112. 
Lithobius, 22. 
Lobster, see Crayfish. 
Loligo pealii, 123. 
Macruran decapod, 28. 
Metridium, 178. 
Molgula: external parts, 135; digest- 
ive system, 136; reproductive sys- 
tem, 1387; circulatory system, 137; 
nervous system, 138; excretory sys- 
tem, 138; peribranchial chamber, 
188 ; respiratory system, 139. 
Mollusca: freshwater mussel, 89; 
hard-shell clam, 103; land snail, 
112; squid, 123. 
Mussel, see Freshwater mussel. 
Mya arenaria, 103. 
Myriapoda, 22. 
Naked rhizopod, 194. 
Nereis: external parts, 61; parapodia, 
63; internal anatomy, 63; diges- 
tive organs, 64; circulatory system, 
64; excretory system, 65; nervous 
system, 65; reproductive system, 
66. 
Nervous system: grasshopper, 18; 
crayfish or lobster, 41; crab, 44; 
Daphnia, 57; Nereis, 65; earth- 
worm, 74; planarian, 78; tapeworm, 
82; Bugula, 87; mussel, 97; oyster, 
102; hard-shell clam, 111; snail, 
121; squid, 133; Molgula, 138; star- 
fish, 147; sea urchin, 154; medusa, 
168, 174. 
Obelia, 169. 
Oligochaetous annelid, 67. 
Oniscus, 46. 
Orthopterous insect, 9. 
Oyster, 99. 
227 
Paramecium: general form, 184; re- 
production, 187; conjugation, 187. 
Pelecypoda: freshwater mussel, 89; 
oyster, 99; hard-shell clam, 103. | 
Pennaria, 163. 
Phyllopod, 56. 
Planarian worm: external parts, 76; 
digestive system, 77; reproductive 
system, 77; nervous system, 78; 
excretory system, 78. 
Plathelminthes: planarian worm, 76 ; 
tapeworm, 80. 
Polychaetous annelid, 61. 
Polyzoa, 85. 
Porcellio, 46. 
Protozoa: Paramecium, 184; Vorti- 
cella, 188; Euglena, 192; Amoeba, 
194. 
Pulmonate gastropod, 112. 
Reproductive system: grasshopper, 
16; caterpillar, 21; crayfish or lob- 
ster, 39; copepod, 55; Daphnia, 57; 
Nereis, 66; earthworm, 71; plana- 
rian, 77; tapeworm, 83; Bugula, 
87; mussel, 97; clam, 110; snail, 
120; squid, 182; Molgula, 137; star- 
fish, 145; sea urchin, 152; Hydra, 
161; tubularian, 168; campanula- 
rian, 173; Grantia, 183; Parame- 
cium, 187; Vorticella, 190; Euglena, 
193 ; Amoeba, 195. 
Respiratory system: grasshopper, 17; 
spider, 27; crayfish or lobster, 35; 
Nereis, 63; mussel, 93; clam, 107; 
snail,116; squid, 129; Molgula, 139. 
Sand-flea, 48. 
Schizopodous crustacean, 52; see Ap- 
pendix, under Malacostraca. 
Sea anemone, 178. 
Sea cucumber, 155. 
Sea urchin: external parts, 149; di- 
gestive system, 151; genital system, 
